feat: Upgrade to Python3 & PyQt5

[000conor000]

Hello,

There was quite a large version gap for the dependencies in the application so quite a lot of extensive changes were needed to bring it in-line with current releases so claude has been used to perform the most of this large-scale work, this is still a work in progress at the moment and still needs extensive testing, it also is pulling in your 13b6f change, the below changes are what have been made:

Python 3 & PyQt5 Migration

• Upgraded all code from Python 2 to Python 3.10+
• Migrated from PyQt4 to PyQt5
• Fixed Shapely 2.0 API compatibility (LineString.coords is now read-only)
• Fixed integer division operators (/ → // where needed)
• Updated deprecated assertEquals to assertEqual for Python 3.12+

Test Suite Fixes

• Fixed Qt threading issues in FlatCAMWorkerStack with proper signal disconnection and thread cleanup
• Added cleanup() method to FlatCAMApp for safe test shutdown
• Fixed FlatCAMRTree.nearest() to properly raise StopIteration
• Fixed dictionary mutation during iteration in test_pool_memory.py
• Resolved circular import in tests/test_tclCommands/init.py
• Created conftest.py for proper test imports
• 48 tests now passing

Build System

• Created comprehensive Makefile with targets:
  • make install - Create venv and install dependencies
  • make run - Run the application
  • make test - Run test suite
  • make test-coverage - Run tests with coverage report
  • make setup-ubuntu - Install system dependencies (Ubuntu/Debian)
  • make setup-macos - Install system dependencies (macOS)
  • make clean - Remove venv and cached files
• Consolidated setup_ubuntu.sh and upgrade_geos.sh into Makefile targets

CI/CD Pipeline

• test.yml - Runs pytest on all PRs (Python 3.10, 3.11, 3.12)
• security.yml - Trivy vulnerability scanner for dependencies and config files
• malware-scan.yml - ClamAV malware scanning on PRs
• release.yml - Automatic releases based on Conventional Commits

Documentation

• Rewrote README.md with:
  • Product description and key concepts
  • Workflow diagrams (Gerber → Geometry → CNC Job → G-Code)
  • Supported file formats table
  • Step-by-step installation instructions
  • Project structure overview
  • Contributing guidelines with Conventional Commits

Repository Cleanup

• Removed ~450KB of unnecessary files:
  • FlatCAM_GTK/ (abandoned GTK port)
  • descartes/ (now installed via pip)
  • sandbox/ (development experiments)
  • bugs/ (old bug reports)
  • Legacy shell scripts
  • pycache and .pyc files
• Updated .gitignore with comprehensive patterns

Test Plan

• All 48 unit tests pass with make test
• Application launches with make run
• Dependencies install correctly with make install
• GitHub Actions workflows validated

Breaking Changes

• Requires Python 3.10+ (was Python 2.7)
• Requires PyQt5 (was PyQt4)

[metalinspired]

@000conor000 Seems that similar work has been done on the official repository Beta branch

[iuvi7]

@000conor000 Is it possible to ask fully complete .msi installer for Win and .deb or AppImage\Flatpack version of FlatCAM?