[bug #64484] [troff] .device should encode special characters in `\[uXXXX]` form

[Deri James]

Follow-up Comment #24, bug #64484 (group groff):

Just a couple of small problems:-

A bookmark like "Minus-hyphens are replaced by \[rs][u2010] in bookmark text"
will look one way in document text but different in a bookmark (same is true
using \E). We need a way to differenciate when \E | \(rs are being used to
prevent me from doing the conversion to a UTF-16 character. You can choose.

The special character \0 is blocked as a horizontal motion, which is true as
are all space characters in groff, but \~ and "\ " are passed as a single
space, so should \0 be treated the same, if used in \X.

Also, we need to coordinate when you make .device, .output and \! work same
way as \X, since I will need to supply a new gropdf and pdf.tmac at the same
time. If you can either start a new branch on Savannah, which you can cherry
pick or rebase from when everything is working, or you can live with
regressions on master for a month or so.




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