Settings: Lockscreen Colors and Lock Image [2/2]

PS2: Separate settings into mutiple and
	create fragment to hold them
PS3: String change.
PS?: Lock image selector
PS?: Custom Lock-image colorize option

Change-Id: I46bb16570916645712b75c05f34235fdbd271650

Conflicts:
	res/values/slim_strings.xml
	res/xml/security_settings_chooser.xml
	res/xml/security_settings_lockscreen.xml
Got left out of last commit