MXKRoomDataSourceManager: Add API to mark all messages as read.
MXKRoomDataSourceManager: Add API to mark all messages as read.

MXKRoomViewController: mark all messages as read for the displayed room.

Restore the piece of code to let the app send read receipt on messages that come in the room the user is reading

matrix-org/matrix-ios-kit,matrix-org/matrix-ios-kit,matrix-org/matrix-ios-kit,matrix-org/matrix-ios-kit