Fixes

- Fixed NPE occuring when Jigsaw fails to find Object in pool. Now just produces a warning in the console like it should
- Fixed pointless copies of lists being created within PlannedStructure
- Fixed mobs spawning within other blocks and suffocating on spawn
- Fixed creating a jigsaw with a non existent object causing jigsaw commands to lock up (#377)
- Fixed editing a non existent jigsaw just not doing anything

src/main/java/com/volmit/iris/object/IrisEntityInitialSpawn.java

@@ -80,6 +80,6 @@ public class IrisEntityInitialSpawn
 
 	private Entity spawn100(Engine g, Location at)
 	{
-		return getRealEntity(g).spawn(g, at.clone().add(0, 1, 0), rng.aquire(() -> new RNG(g.getTarget().getWorld().getSeed() + 4)));
+		return getRealEntity(g).spawn(g, at.clone().add(0.5, 1, 0.5), rng.aquire(() -> new RNG(g.getTarget().getWorld().getSeed() + 4)));
 	}
 }