LicenseHandler(addLicense:): Use `NSWorkspace` to move to trash

The `trashItemAtURL:resultingItemURL:error:` method in `NSFileManager`
is only available starting from Mac OS X 10.8.

Replace this with a more compatible API call. At first I was thinking
about using `NSWorkspace`
`performFileOperation:source:destination:files:tag:`, since it works
starting from 10.0. However, I'd need to remove the `license.plist` path
component from the `NSURL` from `licensePath` in order to pass it to the
`source:` argument. I found `NSURL` `URLByDeletingLastPathComponent`,
which would make perfect sense, except it's only implemented starting in
10.6.

At that point, I figured why not use `NSWorkspace`
`recycleURLs:completionHandler:`, which exists starting in 10.6, and has
a simpler interface than
`performFileOperation:source:destination:files:tag:`.

Import AppKit in order to be able to use `NSWorkspace`.

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