Issue #3376669: Add media library support

file_resup.module

file_resup.services.yml

js/file-resup.js

js/resup.js

...ile_resup_media_library/file_resup_media_library.info.yml

.../file_resup_media_library/file_resup_media_library.module

...resup_media_library/file_resup_media_library.services.yml

...ile_resup_media_library/src/EventSubscriber/BuildForm.php

...media_library/src/Form/MediaLibraryAddFormUploadAlter.php

src/Controller/UploadController.php

src/Entity/FileResup.php

src/Event/BuildFormEvent.php

src/EventSubscriber/BuildForm.php

src/Form/FileFormAlterBase.php

src/Form/FileWidgetFormAlter.php