Auto Crawl

If the player has been detected walking into a block which they otherwise would not have walked into if they were instead crawling and they are currently crouching, then they will start crawling allowing them to move under that block. (this literally only took 40 minutes to code & is just a single mixin on the Entity.class)

This allows players to easily walk into 1 block high areas with no effort at all and wihtout any keybinds.

(Sorry about the lazy reuse of my icon from `Crawl Input` i just really didn't know what else to use for the icon)