Controller and 4 player split screen support

[Shadowblitz16]

I have a friend I would like to play starbound with but he hates mouse and keyboard while I hate using controllers for games 2d and 3d sandbox games.

Please support 4 player split screen and controller support for starbound.
This would make it possible to play starbound on the couch with freinds.
This would also mean that we wouldn't have to mess with window managers and multiple game instances.

if game console versions are ever released, it would already be implemented and be one less thing needed to be done.