[Game] Refactor subtype tally code to be more generic (#7021)

* [Game] Refactor subtype tally code to be more generic

* remove default case

* consolidate empty check

* fix include guard

* backwards compatibility with qt5

cockatrice/src/game_graphics/tally/tally.cpp

@@ -0,0 +1,14 @@
+#include "tally.h"
+
+#include "subtype_tally.h"
+
+QList<TallyRow> Tally::compute(const QList<CardItem *> &cards, const TallyType type)
+{
+    switch (type) {
+        case TallyType::None:
+            return {};
+        case TallyType::Subtypes:
+            return SubtypeTally::countSubtypes(cards);
+    }
+    return {};
+}