QS: add theme switcher tile (TRDS) 2/2

this adds a theme switcher tile

normal click: turn on/off dark/light theme
longpress: switch between the auto modes (manual/light sensor/twilight)

Change-Id: I5f4bb146e240bf31b6486aeff85b0828ee6fbb09

Conflicts:

	res/values/slim_strings.xml
	src/com/android/settings/quicksettings/QuickSettingsUtil.java