Replaces PatreonAccount.isFriendZone with ManagedPatron

Rather than store both the current user’s Patreon account and all cached Friend Zone patrons in the same table, we now store Friend Zone patrons in the new ManagedPatron table. This avoids the need to distinguish between the two at runtime.

AltStoreCore/Patreon/PatreonAPI.swift

@@ -246,10 +246,8 @@ public extension PatreonAPI
         DatabaseManager.shared.persistentContainer.performBackgroundTask { (context) in
             do
             {
-                if let account = DatabaseManager.shared.patreonAccount(in: context)
-                {
-                    context.delete(account)
-                }
+                let accounts = PatreonAccount.all(in: context, requestProperties: [\.returnsObjectsAsFaults: true])
+                accounts.forEach(context.delete(_:))
                 
                 self.deactivateBetaApps(in: context)