Settings: Slimrecents background color && transparency [1/2]

Allow user to specify background color and transparency level for the slimrecents panel.

Change-Id: I6771a5b700b541e630c6d83e4427030fa83d34ea

Conflicts:
	res/values/liquid_strings.xml
	src/com/android/settings/liquid/RecentPanelSettings.java

 Author:    dankoman <dankoman30@gmail.com>
remove unneeded dependency