Add: reasonable default keybindings for circe

The =+irc/send-message= function was added so that we can send private
messages using =SPC m m= or =M-x= with =+irc/send-message=.

modules/app/irc/autoload/irc.el

@@ -36,6 +36,12 @@ workspace for it."
   (and (+irc-setup-wconf inhibit-workspace)
        (call-interactively #'circe)))
 
+;;;###autoload
+(defun +irc/send-message (who what)
+  "Send WHO a message containing WHAT."
+  (interactive "sWho: \nsWhat: ")
+  (circe-command-MSG who what))
+
 ;;;###autoload
 (defun +irc/quit ()
   "Kill current circe session and workgroup."