Keyboard Remapping added!

One piece of feedback I got from some people was that they disliked using the arrow keys to move, and would have preferred WASD. Unfortunately, adding a third set of inputs made some of the tooltips really long and a bit hard to read.

So, I added input rebinding! You can remap any key except fullscreen/escape, and your configuration is saved to a file.

This is my first time implementing something like this - the UI isn’t pretty, but it should just work. If you run into any bugs, please let me know!