Cleaned up and restructured

+ Made the ball shoot after the shoot trigger is released inside _OI_
- Removed constructor parameters for subsystems
+ Added all the subsystems to command base
+ _CommandGroupBase_ to provide command groups with access to subsystems
+ Made _RobotMap_-associated classes static in the .Net sense
- Removed the need for the _ShootBall_ command group
+ Added constants for shooting button
* TODO: correct port numbers
* TODO: correct gamepad numbers
* TODO: delete _Grabber_ subsystem
* TODO: delete _ShootBall_
* TODO: add speed control