Color enhancements

[subnixr]

It would be cool to have options to override:

• font and border color of unselected boxes
• font and border color of selection box
• selection box overlay color and transparency

I was configuring xwinmosaic to use dark colors and window titles are mostly invisible

[ghost]

Also would be good to adjust the xwinmosaic total window background transparency thingy, I use minimum brightness settings on monitor, it gets very dim.
sorry, got fooled by xcompmgr setting shadow on transparent parent..