QS: add theme switcher tile (TRDS) 1/2

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: I62b8e11b5714c179ccbf1c1e341b47c84da0fb56

Conflicts:

	core/java/com/android/internal/util/cm/QSConstants.java
	packages/SystemUI/res/values/slim_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java