Add active display to ChameleonOS [2/2]

PS2:
Add pocket mode option, available if the device has
a proximity sensor.

PS3:
Add option to include ongoing and non-clearable notifications.

PS4:
Allow brightness control from 0% to 100%

PS5:
Refactor for release

Change-Id: Iae55640a31df68542c2af5d95097811b8fb1f66f

Conflicts:

	res/values/arrays.xml
	res/values/strings.xml
	res/xml/system_settings.xml
Active display: Add options for date and am/pm [2/2]

Change-Id: I6af47b2fd47e77398eee98cc6e30b8fcf1a44d45