Settings: add Advanced menu for device-specific settings app

Change-Id: Ib022a224fe71522eb2432a112d2bdf64bc08c926

Conflicts:
	res/values/strings.xml
	res/xml/settings_headers.xml

Conflicts:
	res/values/strings.xml
	res/xml/settings_headers.xml

Conflicts:
	res/values/custom_strings.xml