[2/3] Settings: Add ActiveDisplay options via OmniGears

Base: https://gerrit.omnirom.org/#/c/2417/
OmniGears: https://gerrit.omnirom.org/#/c/2584/

Change-Id: I2376bd9037abcf34903bce43d893872ab490387d

Conflicts:
	res/xml/settings_headers.xml
Try to fix Settings

Change-Id: I936cec6b8029332e721f6aef2ceee9035d8eb0c8