C++11 patchset 6: forbid object copy using assigment/copy function deleters (#5945)

C++11 implement function deleting, it's generally used to prevent some object copy
In script API use this function removal on ScriptApiBase instead of ScriptApiClient/Server/MainMenu, this affect all ScriptApis
Move DISABLE_CLASS_COPY with constructor, the deleted function permit to replace function in its original place

src/client.h

@@ -272,6 +272,7 @@ public:
 	);
 
 	~Client();
+	DISABLE_CLASS_COPY(Client);
 
 	void initMods();
 
@@ -691,7 +692,6 @@ private:
 	GameUIFlags *m_game_ui_flags;
 
 	bool m_shutdown;
-	DISABLE_CLASS_COPY(Client);
 };
 
 #endif // !CLIENT_HEADER