Began to implement user accounts using the database

I'm mostly just testing the waters at this stage, and i've left some debug
code in. There's no way to unload, delete, etc. the accounts, but that
comes later.

server/server_internals.cpp

@@ -27,6 +27,14 @@
 #include <iostream>
 #include <string>
 
+//-------------------------
+//Define the various UIDs
+//-------------------------
+
+int ClientData::uidCounter = 0;
+int CharacterData::uidCounter = 0;
+int CombatInstance::uidCounter = 0;
+
 //-------------------------
 //Define the public members
 //-------------------------