Allow set switching to be triggered by keyboard/mouse buttons/combos.

**Is your feature request related to a problem? Please describe.**
Switching sets is a great feature, but it's hard to be able to switch to a different set by using the limited number of buttons on a game controller.

**Describe the solution you'd like**
I want to be able to activate a different set by pressing a keyboard or mouse button, or a combo of keyboard or mouse buttons.

**Describe alternatives you've considered**
The alternative is to use a gamepad button, which I am unable to do in my case.