Theme dark version of brand color and guided actions background

Follow the same strategy for defaultBrandColor/colorPrimary,  introduce
defaultBrandColorDark/colorPrimaryDark for details action background.
Remove the code that auto-calculate dark version from defaultBrandColor.
Simplify HeadersFragment and FullWidthdetailsOverviewRowPresenter code
by using theme attribute in layout file.

Follow the same naming convension, renamed guidedButtonActionsBackground
to guidedActionsBackgroundDark for the "dark" version.

Change-Id: I05f4ebc0903a3e10b860777c4eb44c4ac5547c9a
14 files changed