Adding gamepad remapping

[fizzlepicklepop]

Right now the controls are hardcoded, it'd be neat if we could have gamepad remapping. I'd personally prefer Z on the left trigger instead of the left shoulder button.

Great job on the project btw, it works awesome for an initial 1.0 release!

[JackandBeans]

Good call, and you're right that it's hardcoded — the pad mapping is fixed in input.cpp, with Z on the left shoulder and L/R on the triggers. 1.0.1 added a keyboard binding table in snapsettings.json, but the pad never got one, which is an inconsistency worth fixing properly.

The plan is a pad binding table in the settings file with the same shape as the keyboard's, so any button or trigger can be any N64 button — that covers your left-trigger Z and everyone else's preference in one go, with an in-game rebinding page after it. 1.0.1 is about to go out with the widescreen culling fix plus Linux and Steam Deck support, so this lands in the release right after.

Thanks for the kind words, and for filing it.