Jeck - Basic set metadata support. Also a minor improvement to WGuiImage.

* Metadata is currently only used in exactly one place: the set's "Pretty Name" is displayed when the set is first unlocked. 
* WGuiImage now has a function to set scaling.

projects/mtg/src/GameApp.cpp

@@ -210,7 +210,6 @@ void GameApp::Destroy()
   delete(DeckStats::GetInstance());
 
   SAFE_DELETE(Subtypes::subtypesList);
-  SAFE_DELETE(MtgSets::SetsList);
 
   SAFE_DELETE(music);
   Translator::EndInstance();