Copy tweak
Added a toast when copying the sessionId or group URL (fixes to the toast UI as well)
Fixed the new conversation screen styling
Fixed the styling of the various attachment screens
Updated the buttons on the attachment screen to behave like the input view buttons
Removed the old OWSNavigationBar and OWSNavigationController (logic was buggy and not actually needed in most cases)
Updated the settings screens to have the "rounded group" styling
Added a "loading conversations" label to the Message Requests screen before the conversations load
Removed the legacy UserCell (replaced with the more reusable 'SessionCell')
Renamed a few things to make them more generic and reusable
Fixed a bug where returning from the background on the conversation screen would result in the input view being hidden
Refactored the PhotoCollectionPickerViewController to use the SettingsTableViewController convention
Updated the SettingsTableViewModel to worked based on Combine instead of the DatabaseObservable so it's more reusable for non-db cases
Fixed a bug where the scroll to bottom button wasn't working
Fixed an issue where searching was running on the main thread (which could cause UI issues)
Updated the searching to interrupt the previous query when the search term changes
Updated the in-conversation settings to be use the new config-based approach (deleted the OWSConversationSettingsViewController)