Auto install:
- Move finding libraries from auto-file into command utils (libraries_from_auto_file)
- Find the first possible code.py alternative in order (like main.py)
- Replace libraries_from_code_py using the ast module instead of findimports
- Get all imports to find local python imports
- Find all dependencies from user code recursively
Update backends:
- Add get_file_content in Backends subclasses
- Remove no longer used get_auto_file_path()
- Add list_dir() to DiskBackend
Update tests
- Add non-bundle imports
- Add submodule import
- Add another mock device to test finding code.py
