Optimized Weighted Random Dungeon Selection

Optimized the selection of random dungeons with weights applied. We now
have a class called WeightedContainer for taping into Minecraft's
weighted selection code without having to extend the WeightedRandomItem
class. Using that, we no longer need to keep a list with duplicate
dungeons to achieve weighted selection, so I removed that variable.

StevenDimDoors/mod_pocketDim/util/WeightedContainer.java

@@ -0,0 +1,27 @@
+package StevenDimDoors.mod_pocketDim.util;
+
+import net.minecraft.util.WeightedRandomItem;
+
+/*.
+ * Implements a simple generic item for using net.minecraft.util.WeightedRandom with objects of type T.
+ * 
+ * This is generally useful for cases in which we already extend an existing class, which prevents us from also
+ * extending WeightedRandomItem or cases in which we would have to break compatibility with previous serialized
+ * instances to add support for WeightedRandomItem.
+ */
+public class WeightedContainer<T> extends WeightedRandomItem {
+	
+	private T data;
+	
+	public WeightedContainer(T data, int weight)
+	{
+		super(weight);
+		this.data = data;
+		super.itemWeight = weight;
+	}
+	
+	public T getData()
+	{
+		return data;
+	}
+}