Removes the previous `AppIcon.appiconset` bundle and replaces it with
all of the necessary asset slices to enable all of the Liquid Glass
variants of the app icon on iOS 26, while also preserving backwards
compatibility with older iOS versions.
<img width="1164" height="388" alt="LiquidGlass"
src="https://github.com/user-attachments/assets/7d6e7a90-3fe5-4853-9c63-35144359f49e"
/>
---------
Co-authored-by: Dean Herbert <pe@ppy.sh>
Tim Oliver
