- RoomViewController, RoomDetailsVC, ContactDetailsVC: fix header layout.
- Use UIScrollView+MatrixKit category to handle the adjusted content inset which is not defined before iOS 11.
- Update the room display name and its avatar url when the Room Summary is updated on state events change (see `[session: updateRoomSummary: withStateEvents:]`).
- Store the riot display room name and its avatar url in the Room Summary.
- Add a new category `MXRoomSummary+Riot` to handle avatar display.
TODO: Increase file store version in `MXFileStore.h`.
Recents List: some room avatars have an unexpected black background.
We apply here the new property `defaultBackgroundColor` defined in MXKImageView class to initialize correctly image background.
