Add AnalyticsScreenTimer and track more screens.

Update Analytics with new methods in MXAnalyticsDelegate.

Riot/Modules/Room/Settings/RoomSettingsViewController.h

@@ -19,6 +19,8 @@
 #import "MediaPickerViewController.h"
 #import "TableViewCellWithCheckBoxes.h"
 
+@class AnalyticsScreenTimer;
+
 /**
  List the settings fields. Used to preselect/edit a field
  */
@@ -52,5 +54,10 @@ typedef enum : NSUInteger {
  */
 @property (nonatomic) RoomSettingsViewControllerField selectedRoomSettingsField;
 
+/**
+ The screen timer used for analytics if they've been enabled. The default value is nil.
+ */
+@property (nonatomic) AnalyticsScreenTimer *screenTimer;
+
 @end