Code cleanup and changes to control

- Changed: Back, Start, Black toggle the mode of ABXY,UDLR instead of
having to be pressed at the same time:
Back toggles control of Aux1 and Aux2
Black toggles control of Aux2 and Aux3
Start toggles control of trim
- Added new tab for Joystick code
- Fixed issue sending multiple button presses
- LED blinks for all button presses