[3/3] OmniGears: Add ActiveDisplay settings to menu

Base: https://gerrit.omnirom.org/#/c/2417/
Settings: https://gerrit.omnirom.org/#/c/2586/

Change-Id: Ibeb35ea4321cf8ee1bdfbb1c6c1f7ab841679932

Conflicts:
	res/values/custom_arrays.xml
	res/values/custom_strings.xml