Added new subsystems: PickupSubsystem, and SensorSubsystem.
PickupSubsystem is for controlling the pickup arm and the SensorSubsystem is intended for the ultrasonic sensor, if we get that working.
Added new command SetIntake to control the pickup mechanism.
Added button mapping: B now extends the pickup mechanism while it is held.
Shoot command now runs the intake wheels to properly seat the ball for launching.