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/AIHints.cpp

@@ -187,7 +187,7 @@ string AIHints::constraintsNotFulfilled(AIAction * action, AIHint * hint, ManaCo
     {
         //Not enough Mana, try to find which mana we should get in priority
         ManaCost * diff = potentialMana->Diff(a->getCost());
-        for (int i = 0; i < Constants::MTG_NB_COLORS; i++)
+        for (int i = 0; i < Constants::NB_Colors; i++)
         {
             if(diff->getCost(i) < 0)
             {