Removed action bar, added new icon for connect/disconnect, changed
formatting of pitch/roll/thrust/yaw to only show integers and added
percent sign to thrust value
Use custom button backgrounds (circles), show connected state with
different colors for Crazyradio (green) and BLE (blue)
Split up preferences in separate preference screens
Removed obsolete res/menu
Added fullscreen mode
Merge branch 'dev_layout'

Conflicts:
	AndroidManifest.xml
	res/values/strings.xml
	res/xml/preferences.xml