Add support for OpenGLES 3.2

[hackbar]

This updates the XML files as well. I think we're supposed to do that?

[hackbar]

Can someone take a look at this?

[dmitshur]

This generally looks reasonable, thanks for working on it.

Have you had a chance to try generating the gles bindings afterwards, and does the generated output seem okay? I think it'd be a matter of running glow generate -out=../gl/v3.2/gles2/ -api=gles2 -version=3.2 -xml=./xml/ -tmpl=./tmpl/ in the root directory. Even if there's some follow up, that can be handled in a separate followup change, but it'd be good to least check first.

[hackbar]

Yeah, I added support for gles2 3.2 in go/gl, and it looks good. It's been working locally for me.

I send a PR to add the generated files for go/gl in go-gl/gl#171.

[dmitshur]

Thanks.