[dev-context] fix for named destinations in URLs

[Pablo Rodriguez]

Hi Hans,

the attached patch replaces "#" with "^" as autoprefix for named
destinations in lpdf.ano (both for MkXL and MkIV).

This would allow urls such as
https://pdf.ousia.tk/autoprefix.pdf#nameddest=^33 ("#" is a reserved
char in urls).

Also “PDF Open Parameters” reserves the usage of "#", "&", "=" and these
special characters cannot be escaped
(https://pdfobject.com/pdf/pdf_open_parameters_acro8.pdf#search=escape).

I hope it helps,

Pablo
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