Added FileTransferInProgress state for ChatMessage + only set Displayed state...
requested to merge fix/removed_workaround_for_not_send_displayed_imdn_in_displayed_state_when_file_transfer_isnt_downloaded_yet into master
Added FileTransferInProgress state for ChatMessage + only set Displayed state when displayed IMDN has been sent (do not set it when using MarkAsRead if there is a file transfer not yet downloaded)