Fixed PocketBuilder and More

1. Changed DungeonSchematic to use an external instance of Random rather
than initializing its own.
2. Created the Pair class, a strongly-typed tuple that was needed in
PocketBuilder.
3. Added a missing calculation in NewDimData for setting the packDepth
field during dungeon initialization.
4. Finished code missing in PocketBuilder. Changes listed above were
needed for this.

StevenDimDoors/mod_pocketDim/util/Pair.java

@@ -0,0 +1,26 @@
+package StevenDimDoors.mod_pocketDim.util;
+
+public class Pair<P, Q>
+{
+	//Pair is an implementation of a 2-tuple with generic parameters for strongly-typed elements.
+	//It's used instead of Minecraft's Tuple type because Tuple doesn't have strongly-typed elements.
+	
+	private P first;
+	private Q second;
+	
+	public Pair(P first, Q second)
+	{
+		this.first = first;
+		this.second = second;
+	}
+	
+	public P getFirst()
+	{
+		return first;
+	}
+	
+	public Q getSecond()
+	{
+		return second;
+	}
+}