Overhauled Server-Side Packet Handling

Threw out the complicated architecture that I'd made for synchronizing
server and client data perfectly. Instead, we now send just enough data
to the client and the resulting code is simpler. Some of the client-side
code is also done so all packet handling should be finished soon.

StevenDimDoors/mod_pocketDim/watcher/IUpdateWatcher.java

@@ -0,0 +1,7 @@
+package StevenDimDoors.mod_pocketDim.watcher;
+
+public interface IUpdateWatcher<T>
+{
+	public void onCreated(T message);
+	public void onDeleted(T message);
+}