2.15.0

• macOS support (thanks to Robin Rademacher)
• update to OpenGL 3.3 (thanks to Robin Rademacher)
• updated CompactNSearch
• updated DiscreGrid
• Fixed CI for Python wheels (thanks to Stefan Jeske)
• Implemented alternative (Blender style) camera controls (thanks to Fabian Löschner)
• updated pybind11 to version 3.0.0
• updated zlib to version 1.3.1
• updated CMake files
• updated pybind11
• added avx implementation of the paper Peer et al., "An implicit SPH formulation for incompressible linearly elastic solids", Computer Graphics Forum, 2018
• bugfixes
• fixed z-sort
• added parameter stepsPerZSort
• bugfix in the PBDWrapper - the wrapper ignored some settings of the scene file