Began segmenting the server's code

I've created a separate branch for this because it's gonna be a bitch to
get compiled, and then I'll still have to ensure that the client & server
are work together correctly.

This build does not compile.

server/client_entry.cpp

@@ -21,4 +21,4 @@
 */
 #include "client_entry.hpp"
 
-unsigned int ClientEntry::uidCounter;
+int ClientEntry::uidCounter = 0;