Add controller rotation / position offsets

[mrbelowski]

Rotation offsets (all axes) replace the Controller Pitch slider recently added (commented out of the UI code)

Position offsets are relative to the controller's (offset) rotation - like it's on a stick attached to the 'real' controller position. Can't think of a use case for this but maybe someone will find it useful if their controller is attached to an object, with the user holding the object instead of the controller