[ADF-1344] New Custom Loading Content Directive for Datatable Component (#4156)

* [ADF-1344] New Custom Loading Content Directive for Datatable Component

* [ADF-1344] Add unit tests for directives on Document List

* [ADF-1344] Add directive prefix to context-menu directive

* [ADF-1344] Old directive selectors have been put back

* [ADF-1344] Add old selector for empty-content directive

lib/core/datatable/directives/custom-empty-content-template.directive.ts

@@ -0,0 +1,29 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Directive } from '@angular/core';
+
+/**
+ * Directive selectors without adf- prefix will be deprecated on 3.0.0.
+ * The empty-folder-content selector will be deprecated as it has been replace by
+ * adf-custom-empty-content-template.
+ */
+@Directive({
+    selector: 'adf-custom-empty-content-template, empty-folder-content'
+})
+
+export class CustomEmptyContentTemplateDirective {}