cargo ships only source resources until they're full or the deposits are empty

resourceRover.h

@@ -7,6 +7,7 @@
 
 namespace battleship{
 	class Structure;
+	class Extractor;
 
 	class ResourceRover : public Vehicle{
 		public:
@@ -21,7 +22,8 @@ namespace battleship{
 
 			vb01::s64 lastLoadTime = 0;
 			int load = 0, capacity, loadRate;
-			Unit *nearestExtractor = nullptr, *nearestRefinery = nullptr;
+			Extractor *nearestExtractor = nullptr; 
+			Unit *nearestRefinery = nullptr;
 			vb01::Node *loadBackground = nullptr, *loadForeground = nullptr;
 	};
 }