Multi-channel support & additional SAML providers

You can now be invited to multiple channels with the same email. On login, we'll let you select which channel you want to access.

Other feature updates and improvements

• Video titles wrap to two lines now.
• Cue highlights no longer break after editing a transcript
• We now support SAML SSO via Azure and Google
• Various visual bugs have been fixed
• Avatars no longer stretch it the original image isn't a perfect square.
• Various performance improvements