miscellany: embedded help working (sort of)

Got the embedded help to return an infowindow with the old plugin format help information, and it processes some of the templating tags, too. Took a little to iron out, but it looks all right so far.

The command syntax check is functional. Since the bot won't be echoing messages to any channels, it doesn't matter if the first word gets mangled. Might be a more elegant way to do this, but it works for now.