Missing `vizdoom_env.py` module causes import error

[arminbazza]

Thanks for releasing the code! Just wanted to point out one error I noticed when trying to run it.

The codebase attempts to import vizdoom_env in src/envs/__init__.py, but this module doesn't exist in the repository, causing an immediate ModuleNotFoundError when trying to run the code.

The root cause is here:
In src/envs/__init__.py, line 3 imports:

from .vizdoom_env import make_vizdoom_env

My temporary workaround has just been to comment this line out.