Support ISO9660 Extended Attribute Record

[Deterous]

Support reading and printing a file extent's Extended Attribute Record.
Also fixes a few extraction issues:

• No longer attempts to extract multi-extent files (print debug line about it being unsupported).
• Properly skips the Extended Attribute Record when extracting files.
• Don't attempt to extract file if file/folder already exists (fixes crash where folder exists with same name as file being extracted).