Prepare SYIOS-26: "The app can work offline when debackgrounded but not when restarting from cold"

In relation with the SDK change on mxSession, we introduce a matrixHandler status to handle following status: loggedOut, logged, storeDataReady, serverSyncDone.
(Boolean 'isLogged' and 'isInitialSyncDone' are removed).

matrixConsole/ViewController/MasterTabBarController.m

@@ -60,7 +60,7 @@
 - (void)viewDidAppear:(BOOL)animated {
     [super viewDidAppear:animated];
     
-    if (! [[MatrixHandler sharedHandler] isLogged]) {
+    if ([MatrixHandler sharedHandler].status == MatrixHandlerStatusLoggedOut) {
         [self showLoginScreen];
     }
 }