this allows zipfiles to be stored anywhere in already registed fileIO (such as zipfiles inside other zipfiles)
see Bullet/examples/pybullet/examples/fileIOPlugin.py
enable vhacd, fileIO and zipFileIO in premake version of PyBullet
fix potential memory leak in mtl loading
Support SDF loading through fileIO plugin.
Replace strcspn by C code (not crossplatform)
Add flag for loadURDF to use color from MTL file (instead from URDF link material)
pybullet.URDF_USE_MATERIAL_COLORS_FROM_MTL and pybullet.URDF_USE_MATERIAL_TRANSPARANCY_FROM_MTL