Erwan - cache fixes - Code review highly appreciated, please criticize my code!

- fix issue 65 (quads when no image  load slowly in shop/deck editor)
- Possibly fix issue 92, please let me know if it reproduces
- Fix issue 97 (Deck editor: weird behavior of deck display)
- Fix issue 39 - please verify
- Issue 56 can probably be closed as well
- Fix issue 86

projects/mtg/src/PlayGuiObject.cpp

@@ -35,7 +35,7 @@ void PlayGuiObject::Update(float dt){
       if (mHeight < defaultHeight)
 	mHeight = defaultHeight;
     }
-  wave = (wave +2) % 255;
+  wave = (wave +2 * (int) (100 * dt) ) % 255;
   for (vector<Effect*>::iterator it = effects.begin(); it != effects.end(); ++it)
     (*it)->Update(dt);
   Pos::Update(dt);