implement card reference widget, fix DeckIcon.vue

bring back eslint and stylelint on compilation, fix almost all warnings, ignore some

Signed-off-by: Julien Veyssier <eneiluj@posteo.net>

src/components/AttachmentDragAndDrop.vue

@@ -63,7 +63,7 @@
 
 <script>
 import { NcModal } from '@nextcloud/vue'
-import attachmentUpload from '../mixins/attachmentUpload'
+import attachmentUpload from '../mixins/attachmentUpload.js'
 import { loadState } from '@nextcloud/initial-state'
 
 let maxUploadSizeState