Optimize and compress png images.

Some png files were not optimally reduced over the years, therefore to
prepare this commit older versions were used.

Tools used:
- `truepng -o4` - reduced png files
- `advdef -f -z -4 -i 1000` - compresed with Zopfli
- `deflopt -b` - optimize the deflate structure

 res/logo.0.png                           | Bin 82 -> 67 bytes
 res/logo.1.png                           | Bin 9547 -> 9515 bytes
 res/logo.1_x64.png                       | Bin 10204 -> 10168 bytes
 res/logo.2.png                           | Bin 50308 -> 50301 bytes
 res/logo.2_x64.png                       | Bin 51225 -> 51162 bytes
 res/logo.3.png                           | Bin 7823 -> 7487 bytes
 res/logo.3_x64.png                       | Bin 8699 -> 8426 bytes
 res/tickcross.png                        | Bin 1024 -> 931 bytes
 res/toolbarw7.png                        | Bin 811 -> 771 bytes
 res/web/img/1pix.png                     | Bin 95 -> 81 bytes
 res/web/img/bottomside.png               | Bin 80 -> 80 bytes
 res/web/img/controlback.png              | Bin 87 -> 74 bytes
 res/web/img/controlbuttondecrate.png     | Bin 115 -> 114 bytes
 res/web/img/controlbuttonincrate.png     | Bin 114 -> 114 bytes
 res/web/img/controlbuttonpause.png       | Bin 99 -> 99 bytes
 res/web/img/controlbuttonplay.png        | Bin 120 -> 119 bytes
 res/web/img/controlbuttonskipback.png    | Bin 119 -> 114 bytes
 res/web/img/controlbuttonskipforward.png | Bin 128 -> 124 bytes
 res/web/img/controlbuttonstep.png        | Bin 122 -> 122 bytes
 res/web/img/controlbuttonstop.png        | Bin 109 -> 106 bytes
 res/web/img/controlvolumebar.png         | Bin 146 -> 146 bytes
 res/web/img/controlvolumegrip.png        | Bin 106 -> 93 bytes
 res/web/img/controlvolumeoff.png         | Bin 276 -> 277 bytes
 res/web/img/controlvolumeon.png          | Bin 167 -> 167 bytes
 res/web/img/headerback.png               | Bin 142 -> 142 bytes
 res/web/img/headerclose.png              | Bin 1347 -> 1337 bytes
 res/web/img/headericon.png               | Bin 756 -> 696 bytes
 res/web/img/leftbottomside.png           | Bin 122 -> 105 bytes
 res/web/img/leftside.png                 | Bin 91 -> 78 bytes
 res/web/img/rightbottomside.png          | Bin 102 -> 102 bytes
 res/web/img/rightside.png                | Bin 78 -> 78 bytes
 res/web/img/seekbargrip.png              | Bin 128 -> 121 bytes
 res/web/img/seekbarleft.png              | Bin 94 -> 85 bytes
 res/web/img/seekbarright.png             | Bin 90 -> 81 bytes
 res/web/img/sliderback.png               | Bin 149 -> 149 bytes
 res/web/img/slidergrip.png               | Bin 157 -> 157 bytes
 res/web/img/vbg.png                      | Bin 175 -> 173 bytes
 res/web/img/vbs.png                      | Bin 105 -> 84 bytes