Hackage release 3.0.0.0

• Make the OpenGLRaw package even more similar to the gl package:
  • Use pattern synonyms for OpenGL enums.
  • Changed module name prefix from Graphics.Rendering.OpenGL.Raw to Graphics.GL.
  • Use slightly different type synonyms for GL type (introducing Fixed on the way):
    • CDouble => Double (for GLclampd, GLdouble)
    • CFloat => Float (for GLclampf, GLfloat)
    • CInt => Fixed (for GLclampx, GLfixed)
    • CInt => Int32 (for GLint, GLsizei)
    • CSChar => Int8 (for GLbyte)
    • CShort => Int16 (for GLshort)
    • CUChar => Word8 (for GLboolean, GLubyte)
    • CUInt => Word32 (for GLbitfield, GLenum, GLhandleARB, GLuint)
    • CUShort => Word16 (for GLushort)