make LinearColorBar themeable

Move colors to resources and use them instead.

Change-Id: I923e5daa219f302dc24e62faab666483109e6620
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge "make LinearColorBar themeable" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0