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
Refactored the AppDelegate from Objective C to Swift
Updated the HomeVC to use GRDB
Refactored a number of the Job types to be driven via GRDB and the new JobRunner
Fixed a bug where the LinkPreviewView wouldn't render correctly in dark mode
Added the rest of the interaction structure to the database (testing some migration logic now - still needs to be finalised)
Updated the YDBToGRDB migrations to wrap their inserts in autorelease pools (helps memory slightly, unfortunately it's caching the YDB data which uses the most memory but we have opted for speed over RAM at the moment)
Updated the MockDataGenerator so it should now "chunk" the code generation (crazy large figures were previously resulting in excessive memory usage)
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)
Setup a migration pattern
Setup the database configuration and security
Started defining the database schema
Started working on the migrations for SessionSnodeKit