Angular src restructured as modular as per angular official guidelines, .travis.yml support added for node 12

src/app/shared/directives/webview/webview.directive.ts

@@ -0,0 +1,8 @@
+import { Directive } from '@angular/core';
+
+@Directive({
+  selector: '[webview]'
+})
+export class WebviewDirective {
+  constructor() {}
+}