give the selection cards their own parts instead of label blobs

src/ui/selection/MultiBuildingContent.h

@@ -6,7 +6,6 @@
 #include "SelectionContent.h"
 #include "SelectionContentFactory.h"
 
-class QLabel;
 
 // The count summary for several selected buildings that do not aggregate
 // (REQ-UI-MULTI-SELECTION, REQ-UI-SELECTION-AGGREGATE): how many of each type, and the
@@ -29,6 +28,4 @@ private:
     void buildSummary();
 
     std::vector<BuildingId> m_ids;
-    QLabel*                 m_countsLabel;
-    QLabel*                 m_totalCostLabel;
 };