Implemented screen orientation lock with preference
Make RC and Camara Screen usable in portrait mode
Fixing a typo
Merge pull request #162 from arthurbenemann/issue_#159

Implemented screen orientation lock with preference
Making RC override more similar to Camera screen so they are easier to understand.
Implementing the onDestroy, onPause, onResume methods in Camera activity.
So the RC override isn't left on when switching screens.
Removing unused button in rc screen.
Externalizing the enable/disable string.
Merge pull request #163 from arthurbenemann/RCorientation

Make RC and Camera Screen usable in portrait mode.
Closes pull #161
Merge branch 'master' into FPV