major refactor of Client and Server

this refactor includes changes to TClient:

- all member fields are now public, but protected with Sync (an alias
  for boost::synchronized_value
- removed all (now) obsolete getters and setters

changes to TServer and TNetwork:

- thread-safe ID generation, previously it was possible for there to be
  ID duplicates. this is now solved by moving id generation and
  assignment into the same mutex locked context.
- deprecated ForEachClientWeak and replaced some usages of it with
  ForEachClient, getting rid of the weak_ptr shit in most places
- implemented a bunch of new functions for getting rid of more weak_ptr
  everywhere

include/Sync.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <boost/thread/synchronized_value.hpp>
+
+/// This header provides convenience aliases for synchronization primitives.
+
+template<typename T>
+using Sync = boost::synchronized_value<T>;
+