* [rlgl] Check for extensions before enabling them
* Shift to glad on macOS
* #undef CORE_OPENGL_33
* Remove version hack and fix ASTC compression assumption
* Remove loader from glad
* Use GLAD_MALLOC/FREE instead of malloc/free
* More explicit extension checking
Moved all external libraries used by raylib to external folder inside
raylib src. Makefile has already been update and also the different
includes in raylib modules.