Added Exception on Bad Terrain Block IDs

DDProperties will now throw an exception that should crash Minecraft if
the user tries to use invalid block IDs for worldgen blocks. Should save
everyone some suffering.

StevenDimDoors/mod_pocketDim/DDProperties.java

@@ -226,6 +226,14 @@ public class DDProperties
 		PocketBiomeID = config.get(CATEGORY_BIOME, "Pocket Biome ID", 250).getInt();
 
 		config.save();
+		
+		//Unfortunately, there are users out there who have been misconfiguring the worldgen blocks to have IDs above 255.
+		//This leads to disastrous and cryptic errors in other areas of Minecraft. To prevent headaches, we'll throw
+		//an exception here if the blocks have invalid IDs.
+		if (LimboBlockID > 255 || PermaFabricBlockID > 255)
+		{
+			throw new IllegalStateException("World generation blocks MUST have block IDs less than 256. Fix your configuration!");
+		}
 	}
 	
 	public static DDProperties initialize(File configFile)