Code editor: virtual area/area designer visual glitches

[icewolfz]

There are rare drawing glitches when opening a map and sometimes when updating that it does not clear the drawn cache info so uses wrong cached data to draw map

[icewolfz]

This still happens i am not sure why some rooms end up with bad cache data, the refresh system has been updated to clear the drawing cache to ensure a true 100% refresh instead just a simple redraw this should at least make it easy to fix the glitch when it happens