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: I63e3c163ce165b09c1331c13554bc090a6217911

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