Milestone started on Jul 1, 2020
v1.0.0: cleaned and refactored
Milestone ID: 942837
Clean-up pass after literal port.
This release will include the privacy features that have been brought up by Signal since the write of
textsecure, such as SealedSessionCipher, and will include several new features (notably stickers, reactions) that are low hanging because of the more modern code base.