Settings: Configurable 0, 90, 180 and 270 degree rotation (2/2)

Change-Id: I48e81ff5b3f89e2b7531a19e42b491182cbf95b4

Conflicts:
	proguard.flags
	res/values/slim_strings.xml

Conflicts:
	res/values/strings.xml
	res/xml/display_settings.xml
Settings: use SwitchPreference instead of CheckBoxPreference

be consistent....lp is using now SwitchPreferences

Change-Id: I794b699e9bc7819efc02886064121e0992c7214a