[2/3]Settings: QuickSettings (SlimBean)

Base: https://gerrit.omnirom.org/#/c/3918/
Telephony: https://gerrit.omnirom.org/#/c/3932/

Builds & Works. Needs refining & code cleanup.

TODO: Move quicksettings to a seperate header in main
      activity.

Change-Id: Ibf1f9ea9333b872a46fb67112ab745e70f76eb1b

Conflicts:
	res/layout/slider_preference.xml
	res/xml/display_settings.xml