[AAE-7817] Show hide columns on datatable (#7580)

* [AAE-7817]  Show hide columns for data-table

* Update

* update tests and uses material harness

* added pipes test

* update

* update

* added tests for datatable

* update

* Added documentation

* Fix for drop column header

* lint fix

* fix lint

lib/core/datatable/directives/main-data-table-action-template.directive.ts

@@ -0,0 +1,36 @@
+/*!
+ * @license
+ * Copyright 2019 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 { AfterContentInit, ContentChild, Directive, TemplateRef } from '@angular/core';
+import { DataTableComponent } from '../components/datatable/datatable.component';
+
+@Directive({
+    selector: 'adf-main-menu-datatable-template'
+})
+export class MainMenuDataTableTemplateDirective implements AfterContentInit {
+
+    @ContentChild(TemplateRef)
+    template: any;
+
+    constructor(private dataTable: DataTableComponent) {}
+
+    ngAfterContentInit() {
+        if (this.dataTable) {
+            this.dataTable.mainActionTemplate = this.template;
+        }
+    }
+}