- created a GLError header file under ACG/GL/ that holds all current GL error...

- created a GLError header file under ACG/GL/ that holds all current GL error checking functions and macros
- removed unnecessary code and files
- updated the includes

closes #1763

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@17666 383ad7c9-94d9-4d36-a494-682f7c89f535