[Spaces] Show spaces in left panel #4509

- Display the none hierarchical list of spaces in the left panel
- Space switching when new space selected
- Refresh space list and recents data after sync

Riot/Modules/Common/Recents/DataSources/RecentsDataSource.h

@@ -19,6 +19,8 @@
 
 #import "PublicRoomsDirectoryDataSource.h"
 
+@class MXSpace;
+
 /**
  List the different modes used to prepare the recents data source.
  Each mode corresponds to an application tab: Home, Favourites, People and Rooms.
@@ -98,6 +100,8 @@ extern NSString *const kRecentsDataSourceTapOnDirectoryServerChange;
  */
 @property (nonatomic) PublicRoomsDirectoryDataSource *publicRoomsDirectoryDataSource;
 
+@property (nonatomic, strong) MXSpace *currentSpace;
+
 /**
  Refresh the recents data source and notify its delegate.
  */