Fix for a crash occurring when the window is resized.

Temporary Platform objects were registering themselves.
The move ctor would then initialize the final object in
the circular buffer (see PlatformSystem), but it would
leave the address of the temporary object registered in
the ObserversManager.

src/sdlmain.cpp

@@ -140,6 +140,12 @@ namespace cloonel {
 		m_localData->resChangeNotifList.Remove(parID);
 	}
 
+	///------------------------------------------------------------------------
+	///------------------------------------------------------------------------
+	void SDLMain::SwapRegisteredForResChange (size_t parID, SizeNotifiableBase* parNotif) {
+		m_localData->resChangeNotifList.Update(parID, parNotif);
+	}
+
 	///------------------------------------------------------------------------
 	///------------------------------------------------------------------------
 	ushort2 SDLMain::WidthHeight() const noexcept {