Update for Angular 9 and Ivy

[johncrim]

It would be super helpful (and useful as a base test case) if this project were updated to use Angular 9 and Ivy.

The guidance I've seen is "don't use Closure with ADVANCED_OPTIMIZATIONS unless you work at Google or are willing to accept that it is an unsupported developer experience". But there's a lot of code in Angular to support closure, and this unsupported experience is probably better than it was a few years ago.

When the smaller size is worth the effort, it would be super helpful to have a minimum example to start from.