split the selection panel into one card per kind of selection

src/ui/selection/ShipyardContent.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "BufferedBuildingContent.h"
+#include "SelectionContentFactory.h"
+
+class QPushButton;
+class RecipeSelectionControl;
+class ShipLayoutPreview;
+
+// The card for a Shipyard (REQ-UI-SELECTION-CONTENT): the schematic selection, the
+// module layout preview and its Configure button (REQ-MOD-UI-PREVIEW), plus the buffers
+// and production progress every buffered building shows.
+//
+// It is the one card whose cycle is not a recipe: a shipyard's materials and production
+// time are its schematic's plus every placed module's (REQ-BLD-SHIPYARD).
+class ShipyardContent : public BufferedBuildingContent
+{
+    Q_OBJECT
+
+public:
+    ShipyardContent(const SelectionContext& context, const SelectionRequest& request,
+                    QWidget* parent = nullptr);
+
+protected:
+    void refreshConfiguration() override;
+    CycleInfo getCycleInfo(const Building& building) const override;
+
+private:
+    RecipeSelectionControl* m_schematicControl;
+    ShipLayoutPreview*      m_layoutPreview;
+    QPushButton*            m_configureButton;
+};