(svn r17897) -Fix [FS#3255]: CB15 and CB36 (capacity) were not always called when they should.

-Codechange: Move capacity calculation to a single function for all vehicle types, so the behaviour can be kept consistent easier.

src/vehicle_func.h

@@ -112,6 +112,8 @@ SpriteID GetEnginePalette(EngineID engine_type, CompanyID company);
  */
 SpriteID GetVehiclePalette(const Vehicle *v);
 
+uint GetVehicleCapacity(const Vehicle *v);
+
 extern const uint32 _veh_build_proc_table[];
 extern const uint32 _veh_sell_proc_table[];
 extern const uint32 _veh_refit_proc_table[];