Summary:
This diff does two things:
- It adds a new SwipeContainer that makes it easy to implement swipe gestures. This is built into listTabular, so you can create a list and define onSwipeLeft/Right to enable gestures.
- It adds support for basic add/remove animations to the thread list. This works by adding a CSS transition to `top` and also leaving removed rows around for a specified time. (these times need to match.) Pretty much just cloned the core idea from TimeoutTransitionGroup.
Test Plan: No tests yet
Reviewers: evan, juan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D2581
