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

Conflicts:

	res/values/colors_custom.xml
	res/values/strings.xml
	src/com/android/settings/DisplaySettings.java