Drone sprite changes

Does two things:
Makes all drones more recognizable for whether they're facing north or south
Makes the blue drone less saturated and removes its unique front facing sprite to look like the rest

Someone complained that you can't tell whether a drone is facing north or south really with the current sprites, and I agree. It's because the arms were floating.

Lineup before:
![](http://puu.sh/cQzPj/32661db068.png)
Lineup after:
![](http://puu.sh/cQADu/c63636edf0.png)


Blue before:
![](http://puu.sh/cQzNj/be9d91d2f6.png)
Red for comparison:
![](http://puu.sh/cQzMh/bccf077998.png)
Blue after:
![](http://puu.sh/cQAI0/8347c0e901.png)


Arms before:
![](http://puu.sh/cQykM/56bbb8a46a.png)
Arms after:
![](http://puu.sh/cQyU8/cae440400c.png)