Make header structure compatible with simulator

Currently, the generated Makefile doesn't successfully compile. But it
is possible to run the simulator again by manually editing the Makefile.

TouchGFX/gui/src/model/Model.cpp

@@ -1,15 +1,19 @@
+#include <gui/model/Model.hpp>
+#include <gui/model/ModelListener.hpp>
+
+Model::Model() : modelListener(0) {}
+
+#ifdef SIMULATOR
+void Model::tick() { modelListener->vehicleStateUpdated(); }
+#else
+
 #include "main.h"
 #include "stm32h7xx_hal.h"
 #include "stm32h7xx_hal_gpio.h"
 #include "stw_defines.h"
 #include "tx_api.h"
 #include "ui.h"
-#include "vehicle.h"
-
-#include <gui/model/Model.hpp>
-#include <gui/model/ModelListener.hpp>
-
-Model::Model() : modelListener(0) {}
+#include "vehicle_state.h"
 
 void Model::tick() {
   ULONG events;
@@ -25,3 +29,5 @@ void Model::tick() {
     modelListener->vehicleStateUpdated();
   }
 }
+
+#endif // SIMULATOR