Fix broken links in link tracking and read receipts
Fix bug in email frame where it wouldn't adjust the height even when
content changed
MessageItem bodies automatically clear the MessageBodyProcessor cache when
the message contents (including metadata) change.
Remove unused Account stuff from nylas-observables
Plugins appIds properly read if there's an environment set
- Show downloading state for inline attachments
- Ensure that the UI updates /after/ the download has completed
- Don't delete finished downloads (previously we were forgetting that a file was downloaded and checking again and again)
Fixes#462
Summary: This diff implements Gmails "load images, always load images from bengotow@gmail.com" option. Someone asked for it late last night and I figured it'd be fun to add. We also needed to refactor the MessageItem to allow for a GPG plugin - MessageItems now subscribe to the body of the message from the messageBodyProcessor, so in the event that processing rules change, someone can invalidate the processor cache by calling `resetCache()`, and then it recomputes bodies and triggers a refresh of each message body.
Test Plan: Updated existing tests, no new tests for this plugin just yet.
Reviewers: evan, juan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D2235
