Guided: Just allow entering guided mode via the mode spinner or RC controller
Guided: Cleaning up old code, using the Altitude Object.
Guided: Add a safety check tp methods that change guided via the UI

Refactoring some names to match the new function.
Merge branch 'master' into GuidedChanges

Conflicts:
	DroidPlanner/src/org/droidplanner/drone/variables/GuidedPoint.java
Merge pull request #549 from arthurbenemann/GuidedChanges

Guided Mode changes