Small page update (and upcoming patch)

I had completely forgotten to document the animation callback arguments in the help text, so I’ve added an additional section with table showing which they are and what they are used for to the plugin page here on itch. (I’ve also adjusted the overall table formatting a bit to make use of rows-spanning cells).

Since this doesn’t affect the function of the plugin, I will hold off on publishing an update to the included help text until likely the end of next week, which will bundle any smaller revisions and fixes that come up until then (including for the obvious typo in the changelog’s release date).