Clean up render.py and fix some minor bugs

- Fix window size and green/red label positioning (#15)
- Fix highlight cursor being laggy without animations
- Clean up some code in render.py, especially RobotSprite by changing self.renderer._settings to self.settings
- Added more animation settings (can turn on/off moving animations, suicide animations, and spawn/death animations)
- Removed a redundant setting in settings.py: bot_animate