* riece-unread.el

* riece-unread.el
(riece-unread-format-identity-for-channel-list-indicator): New
function.
(riece-unread-insinuate): Setup
riece-format-identity-for-channel-list-indicator-functions.

* riece-history.el
(riece-history-format-identity-for-channel-list-buffer): New
function.
(riece-history-insinuate): Setup
riece-format-identity-for-channel-list-indicator-functions.

* riece-highlight.el
(riece-highlight-format-identity-for-channel-list-indicator): New
function.
(riece-highlight-insinuate): Setup
riece-format-identity-for-channel-list-indicator-functions.

* riece-display.el
(riece-format-identity-for-channel-list-buffer): Rename from
riece-format-channel-list-line.
(riece-format-identity-for-channel-list-indicator): New function.
(riece-update-channel-list-indicator): Use it.