It's very outdated, true.
Have you started working on it, yet? I am checking my changes against the current master branch and would then push it into my repo. It's some time ago, but I remember gotten it to work.
I even started to slap some UI onto it. Pretty sure though that's not working, yet. I think I abandoned it along the way. Anyway, this inline-text approach is ok, but I think NodeBB is nowadays thriving for something more - well - convenient. In terms of: Don't make your users learn a syntax to enable them to create a poll (or whatever).
Also, having data like this be part of the actual post is, again, ok. But just like I did with topic-badges, I think we should start separating the data more precisely, i.e. give plugins their own keys in the DB. This way you wouldn't end up with those cryptic texts inside posts/titles, once an admin decides to deactivate a plugin.