Created the ThemeManager and the system to control the dynamic theming
Started updating the main settings screens
Added the AppearanceViewController and connected it to the ThemeManager
Started adding theme values
Started applying theme values throughout
Moved the JobRunner into SessionUtilitiesKit so it can be used by SessionSnodeKit
Exposed a 'sharedLokiProject' value on UserDefaults to remove the hard-coded group name used everywhere
Added "blocking" job support for 'OnLaunch' and 'OnActive' jobs to the JobRunner (will retry until it succeeds)
Added the UpdateProfilePicture and RetrieveDefaultOpenGroupRooms jobs
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