[Keyboard shortcuts] Differentiate Numpad keys from numeric keys

Currently, keyboard shortcuts made with the Numpad keys are registered as if they are regular keyboard keys. For instance, numeric keys on the Numpad function the same way as the numeric row of keys.

I propose to follow to implement Numpad keyboard shortcuts the way Blender handles them: each key is registered as Numpad 1, Numpad 2, Numpad 3, etc. regardless of whether Numlock is turned on or off.

This allows for a larger number of keyboard shortcuts that can be configured with single button shortcuts. Moreover, these can also be used with modifier key combinations, which greatly increases options.