[MUOS-20] Allow downloading assets and screenshots

[gantoine]

Description
^{Explain the changes or enhancements you are proposing with this pull request.}

Fixes #20

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR

Screenshots

[gantoine]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a great new feature for downloading game assets and metadata. The implementation is solid, with a new ImageUtils class to handle image processing and updates to the API and filesystem layers to support this.

I've identified a few areas for improvement:

• Error Handling: There are a couple of places that could benefit from more robust error handling, particularly a potential IndexError when accessing screenshots and a broad try-except block that could be more specific. Making these changes will prevent unexpected crashes.
• API Data Access: The code assumes the API will always return all expected fields. Using .get() for dictionary access would make it more resilient to API changes.
• Code Quality: I've also left some suggestions regarding type hints, removing redundant code, and improving filename parsing for better maintainability and robustness.

Overall, this is a well-structured contribution. Addressing these points will make the new functionality even more reliable.