refactor: Konzept Änderung und API OrderProcessSteps

ajax/frontend/basket/list.php

ajax/frontend/order/getControl.php

ajax/frontend/order/getNext.php

ajax/frontend/order/getPrevious.php

ajax/frontend/order/getStep.php

ajax/frontend/order/saveCurrentStep.php

bin/frontend/controls/OrderProcess.js

bin/frontend/controls/order/Window.js

src/QUI/ERP/Order/AbstractOrderProcessProvider.php

src/QUI/ERP/Order/Basket/Basket.php

src/QUI/ERP/Order/Controls/AbstractOrderingStep.php

src/QUI/ERP/Order/Controls/Address.Create.html

src/QUI/ERP/Order/Controls/Address.Delete.html

src/QUI/ERP/Order/Controls/Address.Edit.html

src/QUI/ERP/Order/Controls/Address.css

src/QUI/ERP/Order/Controls/Address.html

src/QUI/ERP/Order/Controls/Address.php

src/QUI/ERP/Order/Controls/OrderProcess.css

src/QUI/ERP/Order/Controls/OrderProcess.html

src/QUI/ERP/Order/Controls/Ordering.php