
0.5.5 changelog:
- added support for arbitrary shapes (not just circles), and included rectangles for buildings
 - thusly renamed to UnitShapes instead of UnitCircles
 - fixed an error involving unitdefs
 - fixed bug where newly created units wouldn't instantly have a circle
 - reduced highlight brightness by half
 - plays better with other opengl code by using push/popattrib
 - uses GetVisibleUnits instead of GetAllUnits
 
