Add comprehensive test suite, refactor with Python 3 best practices, and update documentation

- Added test_desktop_linux_tools.py with 41 platform-independent tests
- Refactored Desktop-Linux-Tools.py with type hints, dataclasses, and structured classes
- Fixed hanging issues and improved error handling with timeout support
- Enhanced user consent flow with retry limits
- Added .gitignore to exclude binaries and Python cache files
- Updated README.md with Testing section and latest improvements

Author: Stew Alexander

.gitignore

@@ -0,0 +1,44 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info/
+dist/
+build/
+
+# Binary executables
+eget
+*.exe
+*.bin
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# Environment
+venv/
+env/
+ENV/
+.venv
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.log
+*.bak
+