iOS Console: support multi-sessions in Recents and Settings Tabs.

(TODO: update `Home` and `Contacts` Tabs, presently these 2 tabs consider only the first created matrix session).

matrixConsole/ViewController/RecentsViewController.h

@@ -18,7 +18,18 @@
 
 @interface RecentsViewController : MXKRecentListViewController <MXKRecentListViewControllerDelegate, UISearchBarDelegate>
 
-@property (strong, nonatomic) NSString *selectedRoomId; // set a non-nil value to this property will open room details
+/**
+ Open the room with the provided identifier in a specific matrix session.
+ 
+ @param roomId the room identifier.
+ @param mxSession the matrix session in which the room should be available.
+ */
+- (void)selectRoomWithId:(NSString*)roomId inMatrixSession:(MXSession*)mxSession;
+
+/**
+ Close the current selected room (if any)
+ */
+- (void)closeSelectedRoom;
 
 @end