Emulation support for DSA gl(Enable|Disable)VertexArrayEXT and VertexArrayOffset commands.
Initial implementation of Draw*Elements*BaseVertex* emulation.
IBM_texture_mirrored_repeat extension emulation for ES 2.0.
Use REGAL_CALL for GLDEBUGPROC* function typedefs.
Fix logging of string in glNamedProgramStringARB.
Fix logging of commands with ref and mask.