Merge: glesv2: more services from OpenGL ES 2.0 to prepare for gamnit

Merge: glesv2: more services from OpenGL ES 2.0 to prepare for gamnit

This PR adds a few services to the low-level graphics modules to prepare for gamnit.

This is the 2nd PR to use a new style for the glesv2 module. The old code has not yet been fully updated, so the style may vary in the same module. The new style try to stay as close as possible to the names and signatures used by the OpenGL ES 2.0 C API and by webgl.

As usual with this module, for more documentation please refer to the official doc at https://www.khronos.org/opengles/sdk/docs/man/.

Pull-Request: #1708
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>