NavigationBar: Custom height (2/2)

Ported from http://review.cyanogenmod.org/#/c/23610/

Conflicts:
	res/values-de/strings.xml
	res/xml/system_settings.xml
	src/com/android/settings/cyanogenmod/SystemSettings.java

Change-Id: Id5d9adba6853e29c089bad1f0de4edb49c017edf
finnq: I've just added more values and cleaned up the code a little bit.

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	src/com/android/settings/cyanogenmod/SystemSettings.java

Conflicts:
	res/values-de/strings.xml
	res/values/cm_arrays.xml