FS-UAE Launcher 3.2.20 released

Latest changes include: Improved fusion dark theme. Automatically use fusion dark theme if Windows or macOS in dark mode. Arcade: Fixed error with Texture getting multiple size args. Prefer X11 over Wayland because Qt still seems to work better with X11. Netplay server improvements [ztronzo]. PyQt6 support [BluewizardNet]. Build ARM64 versions also via GitHub. Package the Launcher slightly…