Move invites to dedicated sections and enable section collapse (#5683)

* Display invites in dedicated sections

* Activate shrinkable and fix home number of rows for section

* Rework section header

* Display badge in people and room tabs

* Add changelog & remove useless todo

* Improve isSectionShrinked condition, remove useless import and shrinkable sets

* Restore invitation count in tab bar badge

* Display badge for invites section

* Add comment on invites count

* Update right accessory view on data source update

Co-authored-by: Arnaud Ringenbach <arnaud.ringenbach@niji.fr>

Riot/Modules/Home/HomeViewController.m

@@ -111,7 +111,6 @@
     if (recentsDataSource)
     {
         // Take the lead on the shared data source.
-        recentsDataSource.areSectionsShrinkable = NO;
         [recentsDataSource setDelegate:self andRecentsDataSourceMode:RecentsDataSourceModeHome];
     }        
 
@@ -371,9 +370,16 @@
 {
     // Edit the potential selected room (see `onCollectionViewCellLongPress`).
     editedRoomId = selectedRoomId;
-    
-    // Each rooms section is represented by only one collection view.
-    return 1;
+
+    if ([recentsDataSource isSectionShrinkedAt:section])
+    {
+        return 0;
+    }
+    else
+    {
+        // Each rooms section is represented by only one collection view.
+        return 1;
+    }
 }
 
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath