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/mapObjects/CObjectClassesHandler.cpp

@@ -7,11 +7,11 @@
 #include "GameConstants.h"
 #include "StringConstants.h"
 #include "CGeneralTextHandler.h"
-#include "CObjectHandler.h"
 #include "CModHandler.h"
 #include "JsonNode.h"
 
 #include "CRewardableConstructor.h"
+#include "MapObjects.h"
 
 /*
  * CObjectClassesHandler.cpp, part of VCMI engine