[bug #60571] Footnote markers defeat end-of-sentence recognition

[G. Branden Robinson]

Follow-up Comment #6, bug #60571 (project groff):

I propose `\]` for this purpose.  Mnemonic: it resembles the closing bracket
of a common footnote or bibliographic citation marker, and those are the
motivating use cases for it.

If you place a `\]` anywhere between a candidate end-of-sentence character and
the next potential sentence boundary (a newline or second consecutive input
space), that boundary token is forcibly recognized as the end of a sentence.

Interaction with \& and \) is to be determined.  Possibly, \& causes no
interference, and \) and \] can override each other ad libitum.  (Imagine
macros that keep tacking stuff on to the end of a string or input text; the
document author may not have any idea what's going on, so we don't necessarily
want to warn.)

Obviously this will need a unit test that exercises some tricky cases as well
as straightforward ones.

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