SkirmishControl.cs: implement UI tweak requested by KingRaptor
* panel on the right have DimGrey back color with all buttons as ZKButton,
* name tweaks,
* Game Option button goes directly to Game Option menu.
Note: Panel on the left is still slaved to back color settings in Setting Tab.

other:
A fix to minimap picture update (sometimes startbox position doesn't appear to be updated when we mouse drag them)