extract the production rules as free functions over config and building

src/ui/GameWorldView.cpp

@@ -1,5 +1,6 @@
 #include "GameWorldView.h"
 #include "FactoryQueries.h"
+#include "ProductionRules.h"
 
 #include <algorithm>
 #include <cctype>
@@ -1341,7 +1342,7 @@ void GameWorldView::drawBuildings(QPainter& painter)
         // building footprints are rectangular, so a corner of the axis-aligned
         // bounding box is the true corner.
         if (const std::optional<ProductionStatus> status =
-                m_sim->getBuildings().getProductionStatus(b))
+                getProductionStatus(m_sim->getConfig(), b))
         {
             const float px    = getTilePx();
             const float r     = px * 0.18f;