Upgrade to Angular 8

[tdonohue]

Depends on upgrade to Angular 7 PR: #547

Once we are upgraded to Angular 7 successfully, we should immediate upgrade to Angular 8.

Requires senior developer

• Use the Angular Update Guide for advice: https://update.angular.io/#7.0:8.0, from 7 to 8, complexity advanced, using yarn
• upgrade outdated dependencies in package.json using yarn upgrade-interactive
• fix any issues with dependencies that don't have a compatible version, or swap out dependencies if necessary

[tdonohue]

Closing, fixed by #579