*KEY support

[stevesims]

On the beeb, *KEY keynumber [string] would assign a key to a string to a function key.

It'd be nice to add this 😁

[stevesims]

a version of this has arrived with the *hotkey command in 2.2.0

this is not really equivalent to the *key command of the Beeb or other Acorn systems in that the programmed function key will always do an "enter" and can only either replace the existing edit line or wrap the line

leaving this issue open as a version more like Acorn's is still desirable

[stevesims]

an implementation that allows for this would probably be strongly related to #18

the main limitation of *hotkey when compared to Acorn's *key command is that hotkey can only work with a single command, whereas Acorn's *key support would allow multiple commands in a definition. chances are a mechanism that supports an Acorn-style *exec would also allow for an Acorn style *key to be implemented.

essentially this would involve pointing the line editor system at a different source of input than the keyboard, until that source of input has been consumed