Implement lockscreen custom styles in ROMSettings

also rearrange ROMSettings a little bit

Change-Id: I1accdc71134a57ad100769238051216d60dbb3ef

Lockscreen custom wallpaper && lockscreen style options (2/2)

  - Color Fill
  - Custom Wallpaper
  - Default background
  - Alpha slider in color fill
merged http://review.gummyrom.com/#/c/1226/4

customize for Xenon icon

Change-Id: I6d695101c1f4468a0df6d4c3a4a907cc272401ab

Conflicts:
	res/values/custom_arrays.xml
	res/values/custom_strings.xml
	res/xml/lockscreen_style.xml
	res/xml/security_settings_biometric_weak.xml
	res/xml/security_settings_chooser.xml
	res/xml/security_settings_lockscreen.xml
	res/xml/security_settings_password.xml
	res/xml/security_settings_pin.xml