WIP: Use OpenGL 4.x core profile only #6621
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This should make the rendering more stable across different platforms and graphic cards. Particularly this allows using OpenGL 4.1 on macOS, which allow some more modern shaders to be used to achieve some special effects such as this one.
This is mostly ported from PrusaSlicer, so this should be mostly robust. Though still lots of tests are needed.
Currently only part of the code changes have been ported from PS as a PoC, more work is needed to port the remaining code changes.