split the selection panel into one card per kind of selection

src/ui/selection/AutoProductionContent.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "BufferedBuildingContent.h"
+#include "SelectionContentFactory.h"
+
+// The card for a Smelter or a Reprocessing Plant (REQ-UI-SELECTION-CONTENT). Both
+// auto-process whatever they receive and have no player-facing recipe selection
+// (REQ-BLD-SMELTER, REQ-BLD-REPROCESSING), so the card has no configuration group at
+// all; its cycle is whichever recipe is currently in production.
+class AutoProductionContent : public BufferedBuildingContent
+{
+    Q_OBJECT
+
+public:
+    AutoProductionContent(const SelectionContext& context,
+                          const SelectionRequest& request, QWidget* parent = nullptr);
+
+protected:
+    void refreshConfiguration() override;
+    CycleInfo getCycleInfo(const Building& building) const override;
+};