Change how keycaps are handled

[perigoso]

Right now we create a class instance of a keycap, and pass it to the switch initializer

I propose we change the behaviour to passing the class only, and the the class instance will be initialized inside the switch, we pass the keycap args as **kwargs, and the switch essentially passes every kwarg into the keycap initializer

this is to accommodate the addition of LEDs to the switches, see #23 , this also makes sense to handle stabilizers if we ever do in the switch

we could make the passing of these classes a list, the switch would initialize them one by one and append them without caring what they are