Work-in-progress mod for 21:9 support

Even more recent update: Another implementation by a different modder can be found on this blog: http://moqus.blogspot.com More recent update: Most recent implementation of this by Mace can be found here: https://steamcommunity.com/app/582010/discussions/3/1735462352467059599/ Update: You can test out mod by going to this post: https://steamcommunity.com/app/582010/discussions/3/1745594817434182398/?ctp=5#c1745594817445230435