New SbK theme for next release series

Hi Hi
I had a little time between series to take a look at what I could improve. One of the standard features of SbK spins is dark themes. I think I have improved the window theme.

The highlight color is Olive, an older color, since I am testing it on my desktop. That color will change, but the window frame and main body of the window will be the same going forward. The Kvantum matching theme will also use these colors.

As always comments, suggestions and questions are welcome. Please post if you have an opinion.