with structuredAttrs lists will be bash arrays which cannot be exported
which will be a issue with some patches and some wrappers like cc-wrapper
this makes it clearer that NIX_CFLAGS_COMPILE must be a string as lists
in env cause a eval failure
All code that was at xfce4-14 has been moved to xfce/*.
Old expressions that aren't rewritten might be abandoned or broken.
Additonally I've ported the xfce4-14 thunar expression to support
thunarPlugins. We can now support this interface in the Xfce module
again, although I'm not sure if we have any plugins packaged that support
latest thunar.
