Clean up game/zones/logic folder.

Took 6 minutes

cockatrice/src/game/zones/stack_zone_logic.cpp

@@ -0,0 +1,19 @@
+#include "stack_zone_logic.h"
+
+#include "../board/card_item.h"
+#include "card_zone_algorithms.h"
+
+StackZoneLogic::StackZoneLogic(Player *_player,
+                               const QString &_name,
+                               bool _hasCardAttr,
+                               bool _isShufflable,
+                               bool _contentsKnown,
+                               QObject *parent)
+    : CardZoneLogic(_player, _name, _hasCardAttr, _isShufflable, _contentsKnown, parent)
+{
+}
+
+void StackZoneLogic::addCardImpl(CardItem *card, int x, int /*y*/)
+{
+    CardZoneAlgorithms::addCardToList(cards, card, x, true);
+}