Split jslib into multiple modules (#363)

* Split jslib into multiple modules

angular/src/directives/a11y-title.directive.ts

@@ -0,0 +1,28 @@
+import {
+    Directive,
+    ElementRef,
+    Input,
+    Renderer2,
+} from '@angular/core';
+
+@Directive({
+    selector: '[appA11yTitle]',
+})
+export class A11yTitleDirective {
+    @Input() set appA11yTitle(title: string) {
+        this.title = title;
+    }
+
+    private title: string;
+
+    constructor(private el: ElementRef, private renderer: Renderer2) { }
+
+    ngOnInit() {
+        if (!this.el.nativeElement.hasAttribute('title')) {
+            this.renderer.setAttribute(this.el.nativeElement, 'title', this.title);
+        }
+        if (!this.el.nativeElement.hasAttribute('aria-label')) {
+            this.renderer.setAttribute(this.el.nativeElement, 'aria-label', this.title);
+        }
+    }
+}