libinput and Lua plugins

First of all, what's outlined here should be available in libinput 1.29 1.30 but I'm not 100% certain on all the details yet so any feedback (in the libinput issue tracker) would be appreciated. Right now this is all still sitting in the libinput!1192 merge request. I'd specifically like to see some feedback from people familiar with Lua APIs. With this out of the way: Come libinput 1.29 1.30,…