[try 2] winemenubuilder, wineshelllink: move escaping code into wineshelllink

[Vincent Povirk]

This change moves the escape functionality (replacing \ with \\) out
of winemenubuilder and into wineshelllink. The .desktop files
generated by winemenubuilder have the same contents as before.

Because escaping is a function of the .desktop file format, it makes
more sense for wineshelllink to do the escaping.

This will make a simpler fix possible for bug 13303 (which requires \
to be escaped as \\\\, but only in the Exec field of .desktop files),
and a similar approach will be needed in wineshelllink for bug 13963
(since paths may or may not need escaping depending on whether xml or
a .directory file is being written).

This is what I meant to send last time.

Vincent Povirk
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