Remove isView flag from CardZone (#5728)

* Remove `isView` flag from CardZone

This flag is used for two purposes:

 1. It is used as a check for casting to a zone to a `ZoneViewZone`;

 2. Non-view zones are added to the player's zones on construction

This patch removes the `isView` flag and instead:

 1. We directly cast zones to `ZoneViewZone` using a dynamic (qobject)
    cast and use the result of the cast instead of the `isView` flag to
    detect if we are a view zone or not;

 2. The player records its own zones when they are created, simplifying
    control flow.

* Review

cockatrice/src/game/zones/select_zone.h

@@ -26,8 +26,7 @@ public:
                bool _hasCardAttr,
                bool _isShufflable,
                bool _contentsKnown,
-               QGraphicsItem *parent = nullptr,
-               bool isView = false);
+               QGraphicsItem *parent = nullptr);
 };
 
 qreal divideCardSpaceInZone(qreal index, int cardCount, qreal totalHeight, qreal cardHeight, bool reverse = false);