Split jslib into multiple modules (#363)

* Split jslib into multiple modules

angular/src/directives/autofocus.directive.ts

@@ -0,0 +1,26 @@
+import {
+    Directive,
+    ElementRef,
+    Input,
+} from '@angular/core';
+
+import { Utils } from 'jslib-common/misc/utils';
+
+@Directive({
+    selector: '[appAutofocus]',
+})
+export class AutofocusDirective {
+    @Input() set appAutofocus(condition: boolean | string) {
+        this.autofocus = condition === '' || condition === true;
+    }
+
+    private autofocus: boolean;
+
+    constructor(private el: ElementRef) { }
+
+    ngOnInit() {
+        if (!Utils.isMobileBrowser && this.autofocus) {
+            this.el.nativeElement.focus();
+        }
+    }
+}