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/application/ApplicationFactory.ts

@@ -15,7 +15,7 @@ export class ApplicationFactory implements IApplicationFactory {
         }
         this.getter = new AsyncLazy<IApplication>(() => Promise.resolve(costlyGetter()));
     }
-    public getAppAsync(): Promise<IApplication> {
-        return this.getter.getValueAsync();
+    public getApp(): Promise<IApplication> {
+        return this.getter.getValue();
     }
 }