Update proposal:

        - Expand the libGL.so.1 description, to firm up the backwards
          compatibility plan.
        - As a strawman, propose that libOpenGL.so.1 will export all
          OpenGL 4.4 + ARB_compatibility symbols.
        - Comment on Issue (5), performance penalty of dispatching.
        - Expand on Issue (7), symbol collisions between client APIs.
        - Comment on Issue (8), interaction with OpenGL deprecation.