Crash on scene cleanup due to Python 2 remnant

[stiansel]

Describe the issue

The remove_custom_properties function in the _Initializer (link) causes a crash if any scene keys exist when cleanup is called. The error is "RuntimeError: IDPropertyGroup changed size during iteration". This happens in Python 3, as unlike Python 2, the keys-call no longer creates a copy of the keys.

Simple fix: Change for key in bpy.context.scene.keys() to for key in list(bpy.context.scene.keys()).

Minimal code example

import blenderproc as bproc
# Then import a Blender addon which adds any scene keys on import, like HumGen3D:
from HumGen3D import BatchHumanGenerator, human

def _main():
    bproc.init(clean_up_scene=True)  # crash with the above RuntimeError

if __name__ == '__main__':
    _main()

Files required to run the code

No response

Expected behavior

For the init to not throw an error.

BlenderProc version

Github main 2dc7d68

[cornerfarmer]

Thank you, should be fixed now