Finally shattered CObjectHandler.cpp into tiny bits

- This file is now split into multiple smaller files in mapObjects
directory
- CObjectHandler itself now contains only core classes (Handler itself,
CGObject and interfaces)
- Cleaned up excessive #include's through whole project

lib/CCreatureHandler.cpp

@@ -9,6 +9,8 @@
 #include "CModHandler.h"
 #include "StringConstants.h"
 
+#include "mapObjects/CObjectClassesHandler.h"
+
 using namespace boost::assign;
 
 /*