Touch-ups for apitrace NV_path_rendering support.
Add support for REGAL_LOAD_GL, REGAL_LOAD_ES2 and REGAL_LOAD_EGL for loading specific system GL/GLX/WGL/EGL libraries.
Tidy-up for RegalContextInfo codegen.
Mac XCode project udpates.
Apitrace updates, DSA fixes, NV_bindless_texture, NV_draw_texture, AMD_sparse_texture.
Regal gl.py fixups.
Initial build target support for wrangler-mode Regal.
GLEW refresh.
For sane debugging, make regal assertions actually abort.
apparently 'abort's happen all the time in regal.  they shouldn't actually crash.
we're gonna use a bit of regal source outside of regal
Revert "we're gonna use a bit of regal source outside of regal"

This reverts commit e457645fd27d144459afa8e3dae1b65bd94bbb32.
Merge branch 'master' of https://github.com/chadaustin/regal