added converge keyword

converge returns the number of colors spent when casting the spell.
example you pay {2}{W}{W}{R}{B}, converge returns 3, white, black and
red colors spent with...

projects/mtg/include/AllAbilities.h

@@ -556,6 +556,15 @@ private:
                 intValue = card->previous->previous->sunburst;
             }
         }
+        else if (s == "converge")
+        {
+            intValue = 0;
+            for (int i = Constants::MTG_COLOR_GREEN; i <= Constants::MTG_COLOR_WHITE; ++i)
+            {
+                if(card->getManaCost()->getManaUsedToCast()->hasColor(i))
+                    intValue +=1;
+            }
+        }
         else if (s == "targetedcurses")
         {
             if(card->playerTarget)