winemenubuilder: support fd.o file type associations

[Damjan Jovanovic]

Changelog:
* added support for fd.o file type associations

This ambitious patch supports opening documents from an fd.o file
browser through Windows applications installed on Wine. A caching
system under HKCU\Software\Wine\FileOpenAssociations is used to ensure
speed of operation (slow writing of .desktop files to disk and running
of xdg utilities is avoided where unnecessary), to allow removing
associations from fd.o when the application removes them from the
registry, and to only write a fd.o file when something about the
association changes so if the user deletes the fd.o file we don't
wrongly regenerate it. Associations are made using the ProgID, so apps
will also appear in the "Open with..." file browser menu and correctly
associate with new file types.

Closes #12380.

Still needs #17019 to work with apps that install associations under
HKCU\Software\Classes.

Damjan Jovanovic
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