Updated the HomeVC, SettingsVC and GlobalSearch UI to use theming
Removed the "fade view" gradients from the various screens
Added a simple log to the PagedDatabaseObserver to make debugging easier
Updated the FullConversationCell to also show the "read" state for messages
Updated the read receipt icons to use SFSymbols directly
Updated the PlaceholderIcon to use the PrimaryColour's as it's colour options
Cleaned up the creation of the GRDBStorage instance
Fixed an issue where the launch screen wasn't setting it's background colour based on the system setting
Renamed the GRDBStorageError to StorageError (in preparation of legacy 'Storage' relocation)
Consolidated the two Environment classes (in Swift)
Refactored the AppSetup class to Swift