GridCraft app icon (gridcraft.svg and every file derived from it in this directory:
gridcraft-1024.png, gridcraft-macos-512.png, gridcraft.icns, gridcraft.ico, hicolor/).

PLACEHOLDER artwork: original work written for this project by GridCraft contributors (simple
hand-written SVG geometry). No third-party material. Licensed like the rest of GridCraft, under
either of

  * Apache License, Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0)
  * MIT license (https://opensource.org/licenses/MIT)

at your option.

Regenerate the derived files with packaging/icons.sh.