[Feature Request] Support for non-US keyboard layouts

[Echo1707]

Hello, I have a non-US keyboard layout, and when I try to remap a button sometimes a different character is displayed. For example, if I press - it becomes /, if I press ' it becomes -, etc. I mentioned this problem on Discord, and after a brief discussion the user @treellama suggested that a library called SDL should be used to convert from scan codes, which are the locations of keys on the keyboard, to key codes, which is the label on the key.

EDIT: This problem is present in the preferences when viewing/editing the controls, but not when typing in the chat/console in-game.