Granular-configuration-language

Changed

- Adds `!Sub` Tag

Changed

- Adds `!ParseEnv` Tag

Changed

- Adds `InvalidBasePathException` as an exception that can be thrown during the load phase of `LazyLoadConfiguration`.
- This subclasses `KeyError` maintaining compatibility with the state before this exception.
- `LazyLoadConfiguration`'s `base_path` argument now takes a single `str` in addition to the original `typing.Sequence[str]`

Changed

- Adds clear_config

Changed

- Adds string path support to `LazyLoadConfiguration`
- Adds `set_config`/`get_config` pattern
- Adds `Configuration.patch`

Changed

- Adding INI support