Add launcher configuration item

This was jumbled together with a ton of lockscreen stuff that needs
to be fully remade, so I just give up on rebasing it in. Just
add the feature.

PS - #$%#@^% squashed commits for separate features...

Change-Id: I4820edc7710206174b082ace542d76ec459559db

Conflicts:
	res/values/strings.xml

 Author:    Ricardo Cerqueira <cyanogenmod@cerqueira.org>
 On branch jb422
 Changes to be committed:
	new file:   res/drawable-hdpi/ic_settings_cmlauncher.png
	new file:   res/drawable-mdpi/ic_settings_cmlauncher.png
	new file:   res/drawable-xhdpi/ic_settings_cmlauncher.png
	modified:   res/values/strings.xml
	modified:   res/xml/settings_headers.xml
	modified:   src/com/android/settings/Settings.java