Images: recompressed images

I found I had forgotten to check two ways of squeezing more bytes out.

### File size reductions
Total change -6159
<table>
<tr><td>-777</td><td>client/img/3/spritesheet.png</td></tr>
<tr><td>-420</td><td>client/img/2/spritesheet.png</td></tr>
<tr><td>-291</td><td>client/img/3/bat.png</td></tr>
<tr><td>-240</td><td>client/img/3/crab.png</td></tr>
<tr><td>-202</td><td>client/img/3/spectre.png</td></tr>
<tr><td>-193</td><td>client/img/3/achievements.png</td></tr>
<tr><td>-187</td><td>client/img/3/boss.png</td></tr>
<tr><td>-163</td><td>client/img/2/boss.png</td></tr>
<tr><td>-152</td><td>client/img/3/firefox.png</td></tr>
<tr><td>-150</td><td>client/img/3/eye.png</td></tr>
<tr><td>-129</td><td>client/img/3/ogre.png</td></tr>
<tr><td>-117</td><td>client/img/3/deathknight.png</td></tr>
<tr><td>-112</td><td>client/img/3/platearmor.png</td></tr>
<tr><td>-107</td><td>client/img/3/redarmor.png</td></tr>
<tr><td>-105</td><td>client/img/3/leatherarmor.png</td></tr>
<tr><td>-100</td><td>client/img/2/eye.png</td></tr>
<tr><td>-90</td><td>client/img/3/tilesheet.png</td></tr>
<tr><td>-88</td><td>client/img/3/skeleton2.png</td></tr>
<tr><td>-87</td><td>client/img/3/border.png</td></tr>
<tr><td>-85</td><td>client/img/3/rat.png</td></tr>
<tr><td>-81</td><td>client/img/2/border.png</td></tr>
<tr><td>-81</td><td>client/img/3/goldenarmor.png</td></tr>
<tr><td>-79</td><td>client/img/3/skeleton.png</td></tr>
<tr><td>-74</td><td>client/img/2/achievements.png</td></tr>
<tr><td>-74</td><td>client/img/2/ogre.png</td></tr>
<tr><td>-74</td><td>client/img/3/wizard.png</td></tr>
<tr><td>-65</td><td>client/img/2/nyan.png</td></tr>
<tr><td>-63</td><td>client/img/2/spectre.png</td></tr>
<tr><td>-63</td><td>client/img/common/apple-touch-startup-image-1536x2008.png</td></tr>
<tr><td>-61</td><td>client/img/3/mailarmor.png</td></tr>
<tr><td>-47</td><td>client/img/3/clotharmor.png</td></tr>
<tr><td>-47</td><td>client/img/3/snake.png</td></tr>
<tr><td>-44</td><td>client/img/3/goldensword.png</td></tr>
<tr><td>-44</td><td>client/img/3/morningstar.png</td></tr>
<tr><td>-43</td><td>client/img/1/goldensword.png</td></tr>
<tr><td>-43</td><td>client/img/2/bat.png</td></tr>
<tr><td>-38</td><td>client/img/3/bluesword.png</td></tr>
<tr><td>-36</td><td>client/img/3/redsword.png</td></tr>
<tr><td>-35</td><td>client/img/2/goldenarmor.png</td></tr>
<tr><td>-35</td><td>client/img/3/sword2.png</td></tr>
<tr><td>-34</td><td>client/img/2/firefox.png</td></tr>
<tr><td>-33</td><td>client/img/3/barsheet.png</td></tr>
<tr><td>-31</td><td>client/img/2/crab.png</td></tr>
<tr><td>-31</td><td>client/img/2/goldensword.png</td></tr>
<tr><td>-29</td><td>client/img/2/skeleton2.png</td></tr>
<tr><td>-28</td><td>client/img/2/platearmor.png</td></tr>
<tr><td>-27</td><td>client/img/3/wood.png</td></tr>
<tr><td>-26</td><td>client/img/3/sword1.png</td></tr>
<tr><td>-25</td><td>client/img/2/wizard.png</td></tr>
<tr><td>-24</td><td>client/img/2/leatherarmor.png</td></tr>
<tr><td>-24</td><td>client/img/3/item-platearmor.png</td></tr>
<tr><td>-24</td><td>client/img/common/apple-touch-startup-image-1496x2048.png</td></tr>
<tr><td>-24</td><td>client/img/common/apple-touch-startup-image-748x1024.png</td></tr>
<tr><td>-23</td><td>client/img/3/axe.png</td></tr>
<tr><td>-22</td><td>client/img/1/bluesword.png</td></tr>
<tr><td>-22</td><td>client/img/2/redsword.png</td></tr>
<tr><td>-21</td><td>client/img/2/bluesword.png</td></tr>
<tr><td>-21</td><td>client/img/2/skeleton.png</td></tr>
<tr><td>-21</td><td>client/img/2/snake.png</td></tr>
<tr><td>-19</td><td>client/img/1/redsword.png</td></tr>
<tr><td>-19</td><td>client/img/2/mailarmor.png</td></tr>
<tr><td>-18</td><td>client/img/2/sword2.png</td></tr>
<tr><td>-18</td><td>client/img/3/sparks.png</td></tr>
<tr><td>-17</td><td>client/img/1/border.png</td></tr>
<tr><td>-17</td><td>client/img/1/morningstar.png</td></tr>
<tr><td>-17</td><td>client/img/2/deathknight.png</td></tr>
<tr><td>-16</td><td>client/img/1/item-platearmor.png</td></tr>
<tr><td>-16</td><td>client/img/2/clotharmor.png</td></tr>
<tr><td>-15</td><td>client/img/1/bat.png</td></tr>
<tr><td>-15</td><td>client/img/2/axe.png</td></tr>
<tr><td>-15</td><td>client/img/3/sorcerer.png</td></tr>
<tr><td>-13</td><td>client/img/1/deathknight.png</td></tr>
<tr><td>-13</td><td>client/img/2/redarmor.png</td></tr>
<tr><td>-12</td><td>client/img/1/snake.png</td></tr>
<tr><td>-12</td><td>client/img/2/wood3.png</td></tr>
<tr><td>-11</td><td>client/img/1/rat.png</td></tr>
<tr><td>-11</td><td>client/img/2/sword1.png</td></tr>
<tr><td>-11</td><td>client/img/3/item-cake.png</td></tr>
<tr><td>-10</td><td>client/img/1/crab.png</td></tr>
<tr><td>-10</td><td>client/img/1/item-morningstar.png</td></tr>
<tr><td>-10</td><td>client/img/2/morningstar.png</td></tr>
<tr><td>-10</td><td>client/img/3/lavanpc.png</td></tr>
<tr><td>-9</td><td>client/img/1/ogre.png</td></tr>
<tr><td>-9</td><td>client/img/1/spritesheet.png</td></tr>
<tr><td>-9</td><td>client/img/2/item-morningstar.png</td></tr>
<tr><td>-9</td><td>client/img/3/item-goldensword.png</td></tr>
<tr><td>-9</td><td>client/img/3/nyan.png</td></tr>
<tr><td>-9</td><td>client/img/3/octocat.png</td></tr>
<tr><td>-8</td><td>client/img/1/axe.png</td></tr>
<tr><td>-8</td><td>client/img/1/spectre.png</td></tr>
<tr><td>-8</td><td>client/img/2/item-bluesword.png</td></tr>
<tr><td>-8</td><td>client/img/3/item-burger.png</td></tr>
<tr><td>-8</td><td>client/img/3/item-redsword.png</td></tr>
<tr><td>-8</td><td>client/img/3/item-sword2.png</td></tr>
<tr><td>-8</td><td>client/img/common/apple-touch-startup-image-320x460.png</td></tr>
<tr><td>-7</td><td>client/img/1/skeleton.png</td></tr>
<tr><td>-7</td><td>client/img/2/item-cake.png</td></tr>
<tr><td>-7</td><td>client/img/2/scientist.png</td></tr>
<tr><td>-7</td><td>client/img/3/desertnpc.png</td></tr>
<tr><td>-7</td><td>client/img/3/forestnpc.png</td></tr>
<tr><td>-7</td><td>client/img/3/item-clotharmor.png</td></tr>
<tr><td>-7</td><td>client/img/3/villager.png</td></tr>
<tr><td>-6</td><td>client/img/2/item-platearmor.png</td></tr>
<tr><td>-6</td><td>client/img/2/item-redsword.png</td></tr>
<tr><td>-6</td><td>client/img/3/item-goldenarmor.png</td></tr>
<tr><td>-6</td><td>client/img/3/item-morningstar.png</td></tr>
<tr><td>-6</td><td>client/img/3/item-sword1.png</td></tr>
<tr><td>-6</td><td>client/img/common/loading-error.png</td></tr>
<tr><td>-5</td><td>client/img/1/skeleton2.png</td></tr>
<tr><td>-5</td><td>client/img/2/agent.png</td></tr>
<tr><td>-5</td><td>client/img/2/coder.png</td></tr>
<tr><td>-5</td><td>client/img/2/item-axe.png</td></tr>
<tr><td>-5</td><td>client/img/2/item-leatherarmor.png</td></tr>
<tr><td>-5</td><td>client/img/2/sorcerer.png</td></tr>
<tr><td>-5</td><td>client/img/2/villagegirl.png</td></tr>
<tr><td>-5</td><td>client/img/2/wood.png</td></tr>
<tr><td>-5</td><td>client/img/3/beachnpc.png</td></tr>
<tr><td>-5</td><td>client/img/3/item-bluesword.png</td></tr>
<tr><td>-5</td><td>client/img/3/item-flask.png</td></tr>
<tr><td>-5</td><td>client/img/3/rick.png</td></tr>
<tr><td>-4</td><td>client/img/1/nyan.png</td></tr>
<tr><td>-4</td><td>client/img/1/sword1.png</td></tr>
<tr><td>-4</td><td>client/img/2/item-burger.png</td></tr>
<tr><td>-4</td><td>client/img/2/item-clotharmor.png</td></tr>
<tr><td>-4</td><td>client/img/2/item-redarmor.png</td></tr>
<tr><td>-4</td><td>client/img/2/item-sword2.png</td></tr>
<tr><td>-4</td><td>client/img/2/octocat.png</td></tr>
<tr><td>-4</td><td>client/img/3/coder.png</td></tr>
<tr><td>-4</td><td>client/img/3/item-firepotion.png</td></tr>
<tr><td>-4</td><td>client/img/3/item-redarmor.png</td></tr>
<tr><td>-4</td><td>client/img/3/king.png</td></tr>
<tr><td>-4</td><td>client/img/3/scientist.png</td></tr>
<tr><td>-3</td><td>client/img/1/chest.png</td></tr>
<tr><td>-3</td><td>client/img/1/goldenarmor.png</td></tr>
<tr><td>-3</td><td>client/img/1/mailarmor.png</td></tr>
<tr><td>-3</td><td>client/img/1/priest.png</td></tr>
<tr><td>-3</td><td>client/img/1/sword2.png</td></tr>
<tr><td>-3</td><td>client/img/1/wood.png</td></tr>
<tr><td>-3</td><td>client/img/2/guard.png</td></tr>
<tr><td>-3</td><td>client/img/2/item-firepotion.png</td></tr>
<tr><td>-3</td><td>client/img/2/item-goldensword.png</td></tr>
<tr><td>-3</td><td>client/img/2/item-mailarmor.png</td></tr>
<tr><td>-3</td><td>client/img/2/king.png</td></tr>
<tr><td>-3</td><td>client/img/2/lavanpc.png</td></tr>
<tr><td>-3</td><td>client/img/2/priest.png</td></tr>
<tr><td>-3</td><td>client/img/3/agent.png</td></tr>
<tr><td>-3</td><td>client/img/3/guard.png</td></tr>
<tr><td>-3</td><td>client/img/3/item-mailarmor.png</td></tr>
<tr><td>-3</td><td>client/img/common/apple-touch-icon-144x144.png</td></tr>
<tr><td>-3</td><td>client/img/common/apple-touch-icon-72x72.png</td></tr>
<tr><td>-3</td><td>client/img/common/loading.png</td></tr>
<tr><td>-2</td><td>client/img/1/guard.png</td></tr>
<tr><td>-2</td><td>client/img/1/item-flask.png</td></tr>
<tr><td>-2</td><td>client/img/1/item-goldenarmor.png</td></tr>
<tr><td>-2</td><td>client/img/1/item-redsword.png</td></tr>
<tr><td>-2</td><td>client/img/1/leatherarmor.png</td></tr>
<tr><td>-2</td><td>client/img/1/wood3.png</td></tr>
<tr><td>-2</td><td>client/img/2/beachnpc.png</td></tr>
<tr><td>-2</td><td>client/img/2/death.png</td></tr>
<tr><td>-2</td><td>client/img/2/desertnpc.png</td></tr>
<tr><td>-2</td><td>client/img/2/forestnpc.png</td></tr>
<tr><td>-2</td><td>client/img/2/item-flask.png</td></tr>
<tr><td>-2</td><td>client/img/2/rick.png</td></tr>
<tr><td>-2</td><td>client/img/2/sparks.png</td></tr>
<tr><td>-2</td><td>client/img/2/villager.png</td></tr>
<tr><td>-2</td><td>client/img/3/chest.png</td></tr>
<tr><td>-2</td><td>client/img/3/item-leatherarmor.png</td></tr>
<tr><td>-2</td><td>client/img/3/villagegirl.png</td></tr>
<tr><td>-2</td><td>client/img/3/wood3.png</td></tr>
<tr><td>-2</td><td>client/img/common/favicon.png</td></tr>
<tr><td>-1</td><td>client/img/1/coder.png</td></tr>
<tr><td>-1</td><td>client/img/1/death.png</td></tr>
<tr><td>-1</td><td>client/img/1/desertnpc.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-burger.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-cake.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-leatherarmor.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-mailarmor.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-redarmor.png</td></tr>
<tr><td>-1</td><td>client/img/1/item-sword1.png</td></tr>
<tr><td>-1</td><td>client/img/1/king.png</td></tr>
<tr><td>-1</td><td>client/img/1/octocat.png</td></tr>
<tr><td>-1</td><td>client/img/1/rick.png</td></tr>
<tr><td>-1</td><td>client/img/1/sorcerer.png</td></tr>
<tr><td>-1</td><td>client/img/1/sword.png</td></tr>
<tr><td>-1</td><td>client/img/1/talk.png</td></tr>
<tr><td>-1</td><td>client/img/1/villagegirl.png</td></tr>
<tr><td>-1</td><td>client/img/2/item-goldenarmor.png</td></tr>
<tr><td>-1</td><td>client/img/2/item-sword1.png</td></tr>
<tr><td>-1</td><td>client/img/2/loot.png</td></tr>
<tr><td>-1</td><td>client/img/2/shadow16.png</td></tr>
<tr><td>-1</td><td>client/img/3/death.png</td></tr>
<tr><td>-1</td><td>client/img/3/item-axe.png</td></tr>
<tr><td>-1</td><td>client/img/3/priest.png</td></tr>
<tr><td>-1</td><td>client/img/common/apple-touch-icon-114x114.png</td></tr>
</table>