Drop support for Python 3.9 and lower

[jpwhite3]

As several have noted in issues, not supporting Python 3+ has been an issue. Given that the Python Software Foundation has officially ended support for the 2.x line, I though it time to address the issues by dropping support for anything 3.5 or lower. Here are the highlights of the change-set:

• Characterization test suite has been created. Robust functional test suite is still needed.
• All code has been formatted and linted using a moderately strict set of pylint/flake8/black rules.
• A continuous integration process has been setup, leveraging GitHub Actions to automate testing, artifact generation, and release.
• CI configuration tests every commit against Python 3.7, 3.8, 3.9, 3.10 in parallel.

[fuhrmanator]

Yes, waiting patiently for this merge (and eventually the updated npm for ease of install). 🚀

[seperman]

Seems like the maintainer has given up on gitinspector. @adam-waldenberg

[jpwhite3]

In the latest set of changes I've included the following:

• Target: Python 3.13 with backward compatibility to 3.10+
• Focus areas: readability, testability, performance, concurrency
• Build system modernized with pyproject.toml configuration
• Setup.py updated with Python 3.10+ requirements and proper classifiers
• Type hints added to core modules (gitinspector.py, changes.py)
• Poetry-based dependency management implemented with comprehensive pyproject.toml
• Replaced requirements.txt with Poetry configuration including dev dependencies
• Makefile updated to use "poetry run" prefix for all commands
• GitHub Actions CI/CD updated to use Poetry with caching and comprehensive testing
• CONTRIBUTING.md file created with detailed contributor setup guidance
• Project now fully modernized for Python 3.10+ with Poetry workflow
• Created git_utils.py module with robust git command detection using shutil.which() and fallback paths
• Modernized localization.py with pathlib Path usage and comprehensive type hints
• Updated basedir.py to use git_utils module for improved git repository detection
• Fixed file handling to use pathlib.Path and proper context managers
• Test coverage increased from 50% to 53% (3% improvement)
• Implemented robust test strategies: unit tests, integration tests, edge cases, error handling, and concurrent operations
• Fixed Python 3.11+ type annotation compatibility issues
• Resolved cross-platform path handling (macOS /private prefix differences)

[jpwhite3]

Based on the inactivity of the project, I have started a stripped down version of this application. It is written in GO for cross-platform compatibility, and can be found here: https://github.com/jpwhite3/git-inquisitor

Contributions welcome.