keyboard shortcuts: use code for detection and key for display

[evanpelle]

Describe the bug
tldr the "W key" is in the same place on every keyboard and key mapping is done in software - code tells you the physical button name, and key tells you the character that gets emitted when you press that button

User report:

When keybinding with my AZERTY keyboard the camera movement as ZQSD, it still shows WASD. And when I set to null and then bind with Z (for example), it still shows W. So it's not an issue of not changing the key, but an issue of not binding the correct key. I don't want my up being at the bottom of the keyboard, my left on the top, and the two other somewhere in the middle, I want to actually use the + shape as in every other games.

[Mikesteam1234]

Still an issue? I can look into this.

[burnhamrobertp]

In addition to the originally reported issue, you cannot unbind wasd entirely (I would prefer to use these keys for building structure hotkeys, a-la SC2 grid keybindings).

Relatedly: Unbind doesn't actually unbind anything, it just resets and "Reset" will also reset but if another key is bound to the default key, you'll get null but at least for the camera movement, wasd still works. Perhaps manually setting this to other keys would solve this? Not ideal though