This will just leave the list alone if 'Installed games only' is off and the filter text is empty.
Also, it no longer strips the filter text over and over again, but just once at the start. It still has to strip each game name, but it's half the strippings now.
Also, fix some ruff issues.
- Updated min version check in setup.py to Python 3.6
- Updated isort config file and calls to align with v5.x
- Added init-hook for gi imports in .pylintrc to avoid invalid no-member issues
- Makefile: added lock, show-tree, bandit, black, mypy; updated test, cover, dev, isort, autopep8, check, isort-check, flake8, pylint; removed req, requirements;
- Updated .travis.yml to use poetry and make
- Added my email in AUTHORS
- Updated CONTRIBUTING.md
- Updated lint_python.yml to use poetry and make, reorganized instructions to have all install related steps first
- sorted imports: lutris, lutris-wrapper, cleanup_prefix.py and multiple files in tests dir
