- add a new Type : DragDropType
- customize the layout of this new type (Ressources/views/Form/fields.html.twig)
- inside the CarType, link the MechanicalParts to DragDropType
- update the app/config/config.yml in order to take into account the new DragDropType layout:
twig:
    debug:            %kernel.debug%
    strict_variables: %kernel.debug%
    form:
        resources:
            - 'TurhanOzDragDropBundle:Form:fields.html.twig'
- expose all mechanicalParts from CarController
- construct JS interaction from view
- add more fixtures