Path-finder

----------------

----------------
- use 3.7 <= python <= 3.11

----------------
- bugfix: search all file extensions (extension='.*')

----------------
- added 10 extension to EXTENSION_CHOICES

----------------
- renamed package 'finder' to path_finder
- added .idea to .gitignore

----------------
- use setuptools.finder_packages() in setup.py instead of defining hardcoded
- remove 'package_dir={"finder": "."}' from setup.py