Add Plugin Support for Flycast Emulator

📋 Summary

Add official plugin support for Flycast, a popular multi-platform emulator for Sega Dreamcast, Naomi, and Atomiswave systems, to streamline setup and gameplay within LaunchBox.

🎯 Feature Overview

• Allow LaunchBox to automatically download and configure Flycast.

• Enable detection of Dreamcast/Naomi/Atomiswave games for automatic assignment to Flycast.

• Include configuration access directly through LaunchBox’s emulator settings panel.

• Support BIOS validation, widescreen hacks, and controller mappings where applicable.