Lekvar

What's Changed
* Defined strictness levels, allowed overwriting on level 1 (a.k.a True) by zombyguy in https://github.com/zombyguy/lekvar/pull/7
* Added support for overwriting sections from different files by zombyguy in https://github.com/zombyguy/lekvar/pull/8


**Full Changelog**: https://github.com/zombyguy/lekvar/compare/v0.0.4...v0.0.5

Hotfixed package build pipeline.

Added automatized PyPI deployment.

Tag created for GitHub Action testing purposes.

Updated `pyproject.toml` to extract version from GitHub tag

Added following syntaxes for more flexible handling of config variables:
- `INCLUDE <absolute_option_name> (AS <new_local_option_name>)`
- `RENAME <local_option_name> TO <new_local_option_name>`
- `AVOID <local_option_name>`
- `ONLY <local_option_name>, ..., <local_option_name>`