Add virtual numpad

[le717]

Rioforce brought this up to me back when BA was just getting started, and I am finally getting around to filing it lol.

There should be a virtual number that maps to key actions, like capture, next/prev frame, etc, in the vein of the Dragonframe physical and virtual numpad. And naturally, if you support a virtual numpad, it'd be good to add physical numpad support too.

Luckily, I've already written it over in https://github.com/le717/numpad just for BA lol. It needs some updating, per API changes/best practices, but it's not much. It supports both physical and virtual clicks, and actions on both keyup and keydown events. I've even already written the HTML/CSS for the virtual numpad. Once I update the events, it'll still probably have to be updated more to integrate with BA, but it hopefully won't be hard (especially now with the module work you've done).

[charlielee]

Virtual numpad sounds fantastic! I really like the look of what you've done so far. ☺️

Physical numpads should already work with BA using the program's keyboard shortcuts. https://boatsanimator.readthedocs.io/en/latest/features/keyboard-shortcuts/