Core/Vehicles: Remove Vehicle.h dependency from other header files

src/server/game/Scripting/ScriptMgr.cpp

@@ -26,6 +26,7 @@
 #include "ScriptLoader.h"
 #include "ScriptSystem.h"
 #include "Transport.h"
+#include "Vehicle.h"
 
 // This is the global static registry of scripts.
 template<class TScript>