* riece-server.el: Move autoload setting for 'riece-exit before

* riece-server.el: Move autoload setting for 'riece-exit before
riece-open-server.

* riece-message.el (riece-format-message): Use speaker's
server-name instead of the current server-name.

* riece-ignore.el: Autoload 'riece-dialogue-mode.

* riece-identity.el (riece-format-identity): Put
'riece-format-identity-prefix-only property.

* riece-icon.el: Require 'riece-globals and 'riece-signal.

* riece-history.el: Require 'riece-signal.

* riece-highlight.el: Require 'riece-misc.

* riece-alias.el: Require 'riece-signal.

* riece-addon.el: Require 'font-lock, 'riece-options,
'riece-compat, and 'riece-misc.