SystemUI: Fix too long SK bluetooth string

Change-Id: Ib5202b27621e1668e1d4ab4ab09700d4698fcb05
Themes: Make notification list bg themeable

Thanks Thomas Ekelschot :)

Screen of themed resource https://imgur.com/c8t1Zn0

PS2: Add Clark's proposed changes
PS3: Cleanup old color resource in main xml
PS4: Add informative screen

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: I8eb4427747c3eb035b416860c3ca47122e45c16f
Update gitreview

Change-Id: I52b91fa83bbe8a1901c961ee7c8313ddd853c934
Signed-off-by: Lokesh Chamane <lokesh.c703@gmail.com>