Issue 634:

Fixed.  Had to clear the DeckManager whenever the player deck selection screen is displayed.
TODO: Need to implement a caching mechanism that caches the deck information based on deck selection and not a global one.
Currently DeckManager is effectively treating the DeckMetaData as global data.

*some minor tweaks to how deck information is managed/created

projects/mtg/src/GameStateDuel.cpp

@@ -115,6 +115,7 @@ void GameStateDuel::Start()
     {
         if (mParent->players[i] == PLAYER_TYPE_HUMAN)
         {
+            DeckManager::EndInstance();
             decksneeded = 1;
 
             deckmenu = NEW DeckMenu(DUEL_MENU_CHOOSE_DECK, this, Fonts::OPTION_FONT, "Choose a Deck",