dragonballs/ - one sub-folder per custom dragon ball SET, holding that set's dragonball
block geo model + block/item textures. Pair it with a dragons/ folder for the dragon itself.
Create the pack + wishes + spawn settings with /sdu wish -> New Dragon; it writes a DMZ
dragonball pack under <gamedir>/dragonballs/ that points at these assets and registers the
ball blocks on the next restart.
