Implement gtk4 changes

[vimanuelt]

Summary by Sourcery

Implement GTK 4.0 support and introduce a new feature for managing custom repositories. Restructure the codebase into modular components and update documentation to reflect these changes. Prepare the project for future testing enhancements.

New Features:

• Introduce a new feature to manage custom repositories through a dedicated tab in the GUI, allowing users to add and remove custom repositories with ease.

Enhancements:

• Upgrade the application to use GTK 4.0 for the graphical interface, improving the overall user experience.
• Restructure the filesystem to organize code into modules for configuration, repository management, and UI components, enhancing maintainability and scalability.
• Add a new architecture documentation file to provide an overview of the application's structure and modules.

Documentation:

• Update the README to reflect changes in dependencies, installation instructions, and usage, including the addition of custom repository management.

Tests:

• Add a placeholder for unit tests, indicating the intention to implement testing infrastructure.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request implements significant changes to the software-properties-station application, transitioning from GTK 3 to GTK 4 and restructuring the project for better modularity. The changes include updating the GUI, adding support for custom repositories, improving the configuration management, and enhancing the overall architecture of the application.

File-Level Changes

Change	Details	Files
Transition from GTK 3 to GTK 4	Updated GTK requirement from 3.0 to 4.0+ Modified UI code to use GTK 4 API Updated installation instructions for GTK 4 dependencies	README.md ui/ui.py
Project restructuring and modularization	Created separate modules for configuration, repository management, and UI Introduced a new main.py as the entry point Added setup.py for package installation Created an architecture document explaining the new structure	config/config.py repo/ghostbsd_repo_manager.py ui/ui.py software_properties_station/main.py setup.py docs/ARCHITECTURE.md
Addition of custom repository management	Implemented a new CustomReposTab for managing custom repositories Created a custom_repo_manager.py to handle custom repository operations Updated the main UI to include the new custom repositories tab	ui/custom_repos_tab.py repo/custom_repo_manager.py ui/ui.py
Improved logging and configuration management	Changed log file location to /var/log/software-properties-station/ Updated configuration file handling for both GhostBSD and custom repositories Implemented functions to load, save, and manage repository configurations	README.md config/config.py repo/custom_repo_manager.py
Enhanced documentation and project information	Updated README.md with new features, requirements, and usage instructions Added a detailed ARCHITECTURE.md explaining the new project structure Included license information in the README	README.md docs/ARCHITECTURE.md

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