Check browser features for compatibility before loading

[weatherpattern]

Add check for supported browser (last two releases) and

Also add, feature-focused load testing. If a browser doesn’t support the features we require, we should stop loading and show a message, rather than keep going and break arbitrarily somewhere while using the app.

Possible solution:
https://modernizr.com/docs

[stale]

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[Mr0grog]

This is more critical as we push towards getting this more publicly accessible, but I wouldn’t consider it high priority until we have authorization issues worked out.