Social media linters such as Twitter and FB will now use event images as card previews if available.
Linters will only be able to see these images, if unregistered users are able to view events.
Added widget positions for calendar sidebars.
BUG FIX: Fixed some typos in thread entities that were forcing multiple excess DB queries on event thread listings. Thank you @benFF for pointing out that I was referencing incorrect variable names in my entities.