Keybind customization doesn't exist in any capacity, input system overall could use a rework

[jackwright-ual]

An implementation of a key bind interface is required using either Unity's UI or by code.

[Warlander]

DeedPlanner is now using new Unity input system, so adding customizable keybinds should be much easier to do than in the past. Current inputs are also relative to position of keys on the keyboard instead of being fixed, so by default for example WASD movement will still be using the same physical positions of keys under different layouts like AZERTY.

[Warlander]

https://github.com/Warlander/DeedPlanner-3/assets/3524664/a6bc9dc7-aafa-4afb-b10f-3070afc2e937

[Warlander]

Feature done.