Active Display [2/2]

* Amazing work by 0xD34D
* Since he encouraged cherry-picking this, and I was very interested in
     porting this from Moto X, thus I am introducing it here

Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
Change-Id: I134aee969659e62051e12561fa09759385b9654f

Conflicts:
	res/values/cr_arrays.xml
	res/values/cr_strings.xml
	res/xml/crdroid_settings.xml
Active display: allow hiding low priority notifications. [2/2]

Change-Id: Ia4d36b0be909c2f73f99ad399c3f81db868bccd1

Conflicts:
	res/xml/active_display_settings.xml
Active display: Allow apps to be excluded from being displayed [2/2]

Change-Id: Ic9ca7fa536bb30133d900fca65877dda781371a2