po:setmsg and po:appendmsg

Though these might not seem that interesting at first (certainly not as useful as po:send), they can be pretty helpful for, say, an html control panel (sendHtmlAll). Perhaps you'd like to enter a reason for the mute/kick (and therefore `po:setmsg//kick [name]:`, so you can enter a reason easily).

Again, not super useful, but it will find its purpose.