ch-ch-ch-chaaaanges to lists and keyboards

- Mathquill symbols can’t have numbers in them, apparently, so they are
no longer allowed in list names. List1, List2 etc become ListA, ListB.

- The “advanced” keyboard is no longer and its tenants have ascended to
their rightful place in the Numerical menu.

- In place of advanced, we now have a list picker on the main keyboard!
Doesn’t look very pretty, though.