LicenseHandler(addLicense:): Move license file to trash manually

Get the trash directory and move the file there manually. Unfortunately,
this doesn't do the renaming of the file if there's a name conflict, so
we still need to look into how to deal with that.

Thanks to Vincent Tourraine
(https://stackoverflow.com/users/135712/vincent-tourraine) on Stack
Overflow
(https://stackoverflow.com/questions/46089964/how-do-i-get-rid-of-ios-version-is-partial-introduced-in-ios-x-warnings-in-xc/46274231#46274231)
for explaining how to get rid of the `-Wunguarded-availability` warnings
I was getting as a result of using `NSTrashDirectory`. Apparently using
the availability macros doesn't silence the error. Since we're already
checking for availability without `@available`, forcibly silence the
warning here.

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