Somewhat improved overlay semitransparency.
Merge pull request #70 from davidhesselbom/master

Somewhat improved overlay semitransparency.
Fixed invalid reads in FreeArrayList removeAt.
Merge pull request #71 from davidhesselbom/master

Fixed invalid reads in FreeArrayList removeAt.
Overrided free function to prevent any malicious freeing.
Removed overrided free.
Merge branch 'master' of https://github.com/cogneco/ooc-kean into HEAD
Removed float array from parameter list. The float array needed for OpenGL is now in the TraceDrawer class.
Every surface now has its own tracedrawer. Removed float array from parameter list.