Test Ionic 4.0 Upgrades

[CeciliaHinga]

From tenfour-archive created by caharding: ushahidi/tenfour-archive#1229

See if Ionic 4.0 is upgradeable, assess what needs to be updated.

https://www.joshmorony.com/what-to-expect-when-ionic-4-is-released/

https://www.joshmorony.com/my-method-for-upgrading-from-ionic-3-to-ionic-4/

https://www.joshmorony.com/a-primer-on-css-4-variables-for-ionic-4/

https://www.joshmorony.com/using-angular-routing-with-ionic-4/

[CeciliaHinga]

@caharding @mackers here's a good article outlining the Ionic 4 changes https://www.joshmorony.com/my-method-for-upgrading-from-ionic-3-to-ionic-4/.

Estimate for most people it would take on average anywhere from 1 hour to 8 hours to upgrade most applications. If you intend to switch to using the Angular Router (which is recommended) you could probably double that estimate.

If we switch to Angular Router (which they recommend), it would change our URLs from /#/checkins to just /checkins which might be valuable.

[CeciliaHinga]

The Ionic 4 Migration Survival Guide https://www.joshmorony.com/the-ionic-4-migration-survival-guide/

[CeciliaHinga]

https://www.joshmorony.com/what-to-expect-when-ionic-4-is-released/

[CeciliaHinga]

Dale let's leave this out for at least a cycle or 2. I want to make sure we're stable on Ionic 3 and debugging essential user-facing features first.