Fixed bug in AdvancedJoystick that would make the ramping go up to full
output when reaching the end of the deadband.
Added base class for subsystems.

AdvancedJoystick now inherits HOTSubsystem to allow it to update on the
subsystem handler's scheduler.
Forgot to commit the HOTSubsystem class.
Removed friendship from HOTSubsystem, considering that it is not
inherited.
Removed HOTSubsystem in favor of Jin's from staging.
Merge branch 'master' into staging