Use own embedded OpenGL loader #3
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Replace the OpenGL loading defines by an own minimal embedded OpenGL loader. This is the same as upstream imgui is doing now, see ocornut/imgui#4445.
The changes to tex_inspect_opengl.cpp are taken from the upstream imgui repo. The loader is generated with the command:
There is a patch needed for gl3w_gen.py to allow overwriting the symbol prefix to avoid conflicts with the loader used by imgui itself, a PR with that feature is here: dearimgui/gl3w_stripped#1