Investigate using simonbs' KeyboardToolbar for iOS on-screen keyboard buttons

[conath]

A Swift package for keyboard accessory views was published recently called KeyboardToolbar.

It could be useful if the existing UTM iOS keyboard-bar was to be rewritten or redesigned.

[osy]

I like this!

[osy]

Two things we need before we can adopt this:

1. The ability to add more than 6-10 items and have a scroll view hold them.
2. The ability to toggle an item on or off.