Settings: Move Navigation buttons out of interface.

    http://imgur.com/iQi5xMg
    PS15: Move expanded desktop options to display.
    PS16: More cleanup.
    PS17: Remove whitespace.

Change-Id: I923d011cfa72a7c3fe26838032d00aaddf15a664

Conflicts:
	AndroidManifest.xml
	res/xml/notification_drawer.xml
	res/xml/settings_headers.xml
	res/xml/system_ui_settings.xml
	src/com/android/settings/Settings.java
	src/com/android/settings/cyanogenmod/ButtonSettings.java
	src/com/android/settings/cyanogenmod/SystemUiSettings.java