FB: Volume panel background color && transparency [2/2]

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

PS: color now applies instantaneously after setting the preference.
Change-Id: I23a09d302fe090fe4aed6dd9024c73056d14fba1
Fix recent panel defaulting to white on clean flash

Previously, recent panel would default to a solid
    white background on clean flash, until the user
    changed/reset the colors.  This fixes that issue,
    and the recent panel background now defaults to
    the proper semi-transparent white drawable (or
    semi-transparent black drawable if the TRDS
    state is switched).

Change-Id: Iea9d292596e8f4f51b55940e97e6597215ca58c2
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