Refactor to remove "Async" function name suffix

Remove convention where Async suffix is added to functions that returns
a Promise. It was a habit from C#, but is not widely used in JavaScript
/ TypeScript world, also bloats the code. The code is more consistent
with third party dependencies/frameworks without the suffix.

src/presentation/components/TheHeader.vue

@@ -15,7 +15,7 @@ export default class TheHeader extends Vue {
   public subtitle = '';
 
   public async created() {
-    const app = await ApplicationFactory.Current.getAppAsync();
+    const app = await ApplicationFactory.Current.getApp();
     this.title = app.info.name;
   }
 }