Removed custom Random, Max and Min functions from Common.vb
Added ThreadSafeRandom which was missed from the last commit...
Upgraded ObstacleForm to ObstacleWindow
Added protection to CloseDatabase if the database is already closed.
Moved to built in Stack<T> instead of custom one.
Stopped 0 radius bots from being painted (as that upsets GDI+)
Cleared out a load of commented out code.