Removed non-existent token from OpenGL

COMPRESSED_ALPHA_BPTC_UNORM does not appear to be defined anywhere.
Removed.
Use paths without apiversion attribute

Paths that don't define a "version" attribute will now match all
possible versions. This will make it easier to add support for newer
APIs as they are introduced.
Merged ES 2.0 extension tokens to ES 3.0

By adding ES 2.0 extensions tokens to ES 3.0, we have a very
straightforward update path to move an application from the older API
to the newer.