Sprinkle in some deprecations to see what needs to be done with MastodonUser (IOS-192, IOS-189)

Mastodon/Scene/Profile/ProfileViewModel.swift

@@ -33,7 +33,11 @@ class ProfileViewModel: NSObject {
     // input
     let context: AppContext
     let authContext: AuthContext
+
+    @available(*, deprecated, message: "Replace with Account")
     @Published var me: MastodonUser?
+
+    @available(*, deprecated, message: "Replace with Account")
     @Published var user: MastodonUser?
     
     let viewDidAppear = PassthroughSubject<Void, Never>()

MastodonSDK/Sources/CoreDataStack/Entity/Mastodon/MastodonUser.swift

@@ -9,6 +9,7 @@ import CoreData
 import Foundation
 
 /// See also `CoreDataStack.MastodonUser`, this extension contains several 
+@available(*, deprecated, message: "Replace with Mastodon.Entity.Account")
 final public class MastodonUser: NSManagedObject {
     
     public typealias ID = String

MastodonSDK/Sources/MastodonUI/ViewModel/RelationshipViewModel.swift

@@ -96,6 +96,7 @@ public struct RelationshipActionOptionSet: OptionSet {
     }
 }
 
+@available(*, deprecated, message: "Replace with Mastodon.Entity.Relationship")
 public final class RelationshipViewModel {
     
     var disposeBag = Set<AnyCancellable>()