kbd role

Might consideration be given to adding a `kbd` standard role?

I realize I can use a custom role.  But I am encountering the
need for this so often that I wonder if it other are in the
same situation, so that there might be support among the
developers for including this as a standard role.
(And if not something this specific, perhaps a simple
`span` role to inherit from?)

I realize that the multiplication of standard roles is not
desirable.

Cheers,
Alan Isaac

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