Better model system, renamed 'mesh' to 'vertex-buffer' and refactored

There's allot of things to be done, and allot of them have been done...
Here comes libecu 2.0!

EnumGLPrimative -> GLPrimative
Mesh -> VertexBuffer & Model
Are probably the most noticable changes... But there's allot more
smaller things to be polised also.