Add Plugin Support for Project64 Emulator

📋 Summary

Add official plugin support for Project64, a popular Nintendo 64 emulator, enabling seamless configuration and game launching directly within LaunchBox.

🎯 Feature Overview

• Automatically download and set up Project64 through LaunchBox.

• Recognize .n64, .z64, and .v64 file formats.

• Expose core settings such as graphics, audio, and controller profiles.

• Support per-game config overrides and custom plugin selection.

• Optional: integrate GlideN64 or other popular plugins as part of setup.