This a follow-up of RT-27772.

In RT-27772 we have considered app-scope bookmark only. Although it's a good first step,
in the middle term we may not avoid dealing with *document-scoped* bookmark. Moreover
bookmarks may also involved during drag and drop sessions.

Based on what has been done in RT-27772, I've extended the spec to cover the
two elements above.



MacFileNSURL class
==================

Two new methods would be required:

class MacFileNSURL {

/* #1 */ public byte[] getDocumentScopedBookmark(MacFileNSURL baseDocument);
/* #2 */ static MacFileNSURL createFromBookmark(byte[] bookmarkBytes, MacFileNSURL baseDocument);

}


Method #1 would invoke:

- (NSData *) bookmarkDataWithOptions: (NSURLBookmarkCreationOptions) options
     includingResourceValuesForKeys: (NSArray *) keys
                      relativeToURL: (NSURL *) relativeURL
                              error: (NSError **) error;

with the following arguments:

options = NSURLBookmarkCreationWithSecurityScope
keys = nil (or empty array)
relativeURL = <NSURL associated to 'baseDocument' MacFileNSURL instance>

=> that should create a read-write document scoped bookmark




Method #2 would invoke:

+ (id) URLByResolvingBookmarkData: (NSData *)bookmarkData
                         options: (NSURLBookmarkResolutionOptions) options
                   relativeToURL: (NSURL *) relativeURL
             bookmarkDataIsStale: (BOOL *) isStale
                           error: (NSError **) error;

with the following arguments:

bookmarkData = the bytes from "bookmarkBytes"
options = NSURLBookmarkResolutionWithoutUI | NSURLBookmarkResolutionWithSecurityScope
relativeURL = <NSURL associated to 'baseDocument' MacFileNSURL instance>

=>that should decode the bookmark bytes generated by method #1



Clipboard class
===============

class javafx.scene.input.Clipboard {

public List<java.io.File> getFiles();

}

When "glass.macosx.enableFileNSURL" property is set, Clipboard.getFiles()
should return MacFileNSURL instances (using MacOS X call [NSURL URLFromPasteboard]).