DashClock: add background color choice + add more colors for text then just white & black

This commits adds the ability to control beside the transparency as well the background color
of the widget. As well we give the user in Romans color picker style the ability to choose between
15 colors for forground (text) and backgroundcolor

As well cleanup TRDS colors.xml and just leave the options which we really change

Change-Id: I78291fc3a2356f14babe9814bf08172e244a6989