ios: do not start chat if it was stopped, deliver "app stopped" notifications (#3535)

* add stopped notifications, remove full off mode

* core: allow initializing chat data without starting chat

* ios: ask before starting chat if it was stopped

* correct text

Co-authored-by: spaced4ndy <8711996+spaced4ndy@users.noreply.github.com>

* fix comment

---------

Co-authored-by: spaced4ndy <8711996+spaced4ndy@users.noreply.github.com>

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -1235,6 +1235,9 @@ func initializeChat(start: Bool, dbKey: String? = nil, refreshInvitations: Bool
         try startChat(refreshInvitations: refreshInvitations)
     } else {
         m.chatRunning = false
+        try getUserChatData()
+        NtfManager.shared.setNtfBadgeCount(m.totalUnreadCountForAllUsers())
+        m.onboardingStage = onboardingStageDefault.get()
     }
 }
 
@@ -1251,6 +1254,8 @@ func startChat(refreshInvitations: Bool = true) throws {
             try refreshCallInvitations()
         }
         (m.savedToken, m.tokenStatus, m.notificationMode) = apiGetNtfToken()
+        // deviceToken is set when AppDelegate.application(didRegisterForRemoteNotificationsWithDeviceToken:) is called,
+        // when it is called before startChat
         if let token = m.deviceToken {
             registerToken(token: token)
         }