Removed GL header includes, it's covered by GLEW
Cleanups
Added pointcloud reading functions
Added Truevision Targa Reader/Writer
Added Targa lib to credits
Added sys_time functions
Added tailchomp(), for cleaning the tails of strings
Removed redundant declarations
Added sys_time() and sys_ticksecond to make sense of it
Added support for loading Wavefront OBJ files and their materials
Updating libraries