Upgrade from v3.0 to v3.1

Template paths are replaced by snake case in the attribute and maker to match with the new naming convention in Sylius:
- Admin/UiElement/ is now admin/ui_element/
- Shop/UiElement/ is now shop/ui_element/
All template paths in the plugin are updated to match the new naming convention:
- Admin/ is now admin/
- Admin/UiElement/ is now admin/ui_element/
- Admin/formContainer.html.twig is now admin/form_container.html.twig
- Form/ is now form/
- Icon/Ux is now icon/ux/
- Shop/ is now shop/
- Shop/UiElement/ is now shop/ui_element/
- Wireframe/ is now wireframe/

Navigation Menu