Started migration of attachment manager from vue

- Created new dropzone component.
- Added standard component event system using custom DOM events.
- Added tabs component.
- Added ajax-delete-row component.

resources/js/components/ajax-delete-row.js

@@ -0,0 +1,32 @@
+/**
+ * AjaxDelete
+ * @extends {Component}
+ */
+import {onSelect} from "../services/dom";
+
+class AjaxDeleteRow {
+    setup() {
+        this.row = this.$el;
+        this.url = this.$opts.url;
+        this.deleteButtons = this.$manyRefs.delete;
+
+        onSelect(this.deleteButtons, this.runDelete.bind(this));
+    }
+
+    runDelete() {
+        this.row.style.opacity = '0.7';
+        this.row.style.pointerEvents = 'none';
+
+        window.$http.delete(this.url).then(resp => {
+            if (typeof resp.data === 'object' && resp.data.message) {
+                window.$events.emit('success', resp.data.message);
+            }
+            this.row.remove();
+        }).catch(err => {
+            this.row.style.opacity = null;
+            this.row.style.pointerEvents = null;
+        });
+    }
+}
+
+export default AjaxDeleteRow;