added meld(cardname)

added meldfrom(cardname|cardname) helper class.

auto={0}:target(arbor colossus|mybattlefield) meld(Arc Runner)
auto=meldfrom(arbor elf|Arbor Colossus)

projects/mtg/src/MTGCardInstance.cpp

@@ -195,6 +195,7 @@ void MTGCardInstance::initMTGCI()
     morphed = false;
     turningOver = false;
     isMorphed = false;
+    MeldedFrom = "";
     isFlipped = false;
     isPhased = false;
     isCascaded = false;