🕹  Input system

### What would you like to add?

## Features
- [ ] Support multiple keys bound per action ("multi-key")
- [ ] `InputData` struct that supports Button/Keyboard input types
  - [ ] Implement `InputData` in place of button string properties

## UI
- [ ] An acceptable editor menu supporting multi-key
- [ ] Example ingame rebinding menu that supports multi-key

### Any extra information?

_No response_