Settings: Add screen color settings

Add "Screen Color" item in settings.
This function support set Hue, Saturation, Contrast and Intensity value,
and screen color will be changed by this settings.

Change-Id: If6f6e7ee7f28862476a8b955cd3252175fefa2a1

Settings : Fix CustomScreenColor when picking an image

Change-Id: I510b562eb0e9fb9b558380db5c5d6e818ba17d12

Settings: Start service as explicit intent

Needed for API level 21. Add some ressource bits, set text color to
white.

Change-Id: I9c4a9139be69fa5c6d6c74055b5475f0d930c93a

Conflicts:
	src/com/android/settings/DisplaySettings.java