fb: TRDS dark base theme

Change-Id: Ie25abfbf5258ac479ca8bc91033f6892bbbc6741
trds:[framework] dark images adjustments

Change-Id: Ie038c4a1aa535708c23f099fb5e836407e3d1603
TRDS: Dark DocumentsUI

for Downloads app

PS:
- fix settings

Change-Id: I87d49e97b8a0a67bd4d85f0137eb0960155428cb
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/slim/QSConstants.java
	packages/SystemUI/res/values/slim_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

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