Updated the migrations to indicate progress (Potential to base progress for the "processing" sections on the file size of the legacy database)
Updated the JobRunner to properly support concurrent queues for sending/receiving (other queues are still serial)
Added the typing indicator logic into the ConversationVC
Put code into SUKLegacy for connecting to the YDB database
Fixed a couple of minor UI bugs with the GalleryRailView
Updated the media gallery selection screen to use the appropriate system theme colouring (was painful to randomly swap from dark mode to like for one screen...)
Added an alert for when the database migration fails
Deleted the legacy migrations (manually applying any unapplied changes as part of the YDB to GRDB migration process)
Renamed the 'Legacy' classes to have their library prefix (avoid confusion)
Removed the legacy Objective C Thread code (pulled only the NSCoding stuff into the 'SMKLegacy' type)
Refactored the SignalApp class to Swift
Fixed a horizontal alignment issue in the ConversationTitleView
Fixed an issue where expiration timer update messages weren't migrated or rendering correctly
Fixed an issue where expiring messages weren't migrated correctly
Fixed an issue where closed groups which had been left were causing migration failures (due to data incorrectly being assumed to be required)
Shifted the Legacy Attachment types into the 'SMKLegacy' namespace
Moved all of the NSCoding logic for the TSMessage
Added migrations for contacts and started working through thread migration (have contact and closed group threads migrating)
Deprecated usage of ECKeyPair in the migrations (want to be able to remove Curve25519Kit in the future)
Changed the min OS version to iOS 13.0 (support for 'Identifiable')
Removed the alternate approaches to fetching the userKeyPair and userPublicKeyHexString (no consistently routed through the caching method)
Migrated the 'OWSIdentityManager' logic to use the new 'Identity' type
Added the 'Setting' table and got the pattern working fairly nicely (unfortunately there isn't a good way to avoid key collision without proper enums)
Updated the SessionSnodeKit to migration it's data from YDB to GRDB
Updated the SessionSnodeKit to use GRDB throughout it's logic
Morgan Pretty