Started Rewriting Packet Handling

Started rewriting our packet handling code. Deleted PacketHandler in
favor of using sided (Server-, Client-) packet handlers to make it
easier to follow what's going on in our code. Added some event-based
handling of updates which greatly simplified signaling that data needs
to be sent, but it's not completely done yet.

StevenDimDoors/mod_pocketDim/watcher/IOpaqueMessage.java

@@ -0,0 +1,8 @@
+package StevenDimDoors.mod_pocketDim.watcher;
+
+import java.io.DataOutputStream;
+
+public interface IOpaqueMessage
+{
+	void writeToStream(DataOutputStream stream);
+}

StevenDimDoors/mod_pocketDim/watcher/IOpaqueReader.java

@@ -0,0 +1,8 @@
+package StevenDimDoors.mod_pocketDim.watcher;
+
+import com.google.common.io.ByteArrayDataInput;
+
+public interface IOpaqueReader
+{
+	IOpaqueMessage read(ByteArrayDataInput source);
+}

StevenDimDoors/mod_pocketDim/watcher/IUpdateWatcher.java

@@ -0,0 +1,8 @@
+package StevenDimDoors.mod_pocketDim.watcher;
+
+public interface IUpdateWatcher
+{
+	public void onCreated(IOpaqueMessage message);
+	public void onUpdated(IOpaqueMessage message);
+	public void onDeleted(IOpaqueMessage message);
+}

StevenDimDoors/mod_pocketDim/watcher/UpdateWatcherProxy.java

@@ -0,0 +1,51 @@
+package StevenDimDoors.mod_pocketDim.watcher;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class UpdateWatcherProxy implements IUpdateWatcher
+{
+	private List<IUpdateWatcher> watchers;
+	
+	public UpdateWatcherProxy()
+	{
+		watchers = new ArrayList<IUpdateWatcher>();
+	}
+
+	@Override
+	public void onCreated(IOpaqueMessage message)
+	{
+		for (IUpdateWatcher receiver : watchers)
+		{
+			receiver.onCreated(message);
+		}
+	}
+
+	@Override
+	public void onUpdated(IOpaqueMessage message)
+	{
+		for (IUpdateWatcher receiver : watchers)
+		{
+			receiver.onUpdated(message);
+		}
+	}
+
+	@Override
+	public void onDeleted(IOpaqueMessage message)
+	{
+		for (IUpdateWatcher receiver : watchers)
+		{
+			receiver.onDeleted(message);
+		}
+	}
+	
+	public void registerReceiver(IUpdateWatcher receiver)
+	{
+		watchers.add(receiver);
+	}
+	
+	public boolean unregisterReceiver(IUpdateWatcher receiver)
+	{
+		return watchers.remove(receiver);
+	}
+}