[Feature Request] Support for Modifier Keys in Mouse Aim

[caffeinepyroxene]

Description
Allow using keys like CapsLock, LeftCtrl, Tab, etc for binding Mouse Aim

Currently you can only bind character keys between A-Z and 0-9

[Xtr126]

This needs a larger refactor in the code, but it seems worth doing so I'm working on it now.

[Xtr126]

Some more testing and it should be ready