Summary:
When there is a link in a text cell (and formula cells), it will be
rendered with a little clickable icon wrapped in the anchor tag
with a proper link. Only links that starts with https? will be
rendered as links.
Links are shown in a Text and Formula fields, inside a GridView,
CardView and in the Import preview dialog.
Test Plan: Browser tests
Reviewers: alexmojaki
Reviewed By: alexmojaki
Subscribers: dsagal, alexmojaki
Differential Revision: https://phab.getgrist.com/D3070
