feat: revert hack for time card columns, use scripts instead

src/data/card.hpp

@@ -61,9 +61,6 @@ public:
   /// Get the identification of this card, an identification is something like a name, title, etc.
   /** May return "" */
   String identification() const;
-
-  String valueOfDataKey(FieldP fieldP);
-
   /// Does any field contains the given query string?
   bool contains(QuickFilterPart const& query) const;