Move lift override controls to the stick while the button is pressed down.
Remove option for operator to override up (since this was never needed and is potentially dangerous).
Testing Performed
Environment: Practice bot.
Moved the lift up and down on manual and then switched to override and verified that the override was running when it should run (with print statements) and manual was running otherwise.
Cool. As discussed we will leave overrideUp out of the regular code because Bad Things Can Happen (TM) if it happens accidentally, but if we ever do need it in an emergency it will be tested and ready to use.
Working towards #125.
Summary of Changes
Testing Performed
Environment: Practice bot. Moved the lift up and down on manual and then switched to override and verified that the override was running when it should run (with print statements) and manual was running otherwise.