FB: Slimrecents card/text color [2/2]

Allows user to set custom colors for Slimrecents card
    header text and background.

PS: fixed expanded card (thumbnail) background
Change-Id: I896a4db4ce235dc53858381347379d5fd7f7e796

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java