Modifications to make the game more generic.

Included in a new modrules.xml tags.
 <cardgui>
   <background> Stores information concerning the colors </ background>
   <renderbig> Stores information to draw the card </ renderbig>
  <rendertinycrop> Stores information to draw the card </ rendertinycrop>
 </ cardgui>

 Change the variables array for vectors

projects/mtg/src/ActionStack.cpp

@@ -240,7 +240,7 @@ Interruptible(observer, id), tc(tc), cost(_cost), payResult(payResult)
 int Spell::computeX(MTGCardInstance * card)
 {
     ManaCost * c = cost->Diff(card->getManaCost());
-    int x = c->getCost(Constants::MTG_NB_COLORS);
+    int x = c->getCost(Constants::NB_Colors);
     delete c;
     return x;
 }