encode and decode paths in Util::Pathname #2545
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Fix #2413 and various straightforward file name encoding issues that can be addressed directly in Util::Pathname. It is stacked on top of #2544 because it also uses Encode::Locale, and of course it is easier to test if I can pass non-ASCII characters to latexmlpost.
This is not yet a complete fix for all encoding issues, such as #2336, because I still need to replace every call to
open,readdir,-r,-f, and so on with suitable calls topathname_openand similar. That's going to be a lot more invasive.