More backports.
More work on making Swift code with PlayerPROKit easier.
Make the PlayerPROKit class objects be copy/pasted using the pasteboard.
Remove redundant declarations in the attributes file.
All data types in PlayerPROKit now conform to NSPasteboardReading and NSPasteboardWriting protocols.
Remove the MusicWrapper object class: We won’t be using the wrapper.
Add support for future expansion of sound driver settings for specific drivers/back-ends.
Improvements to the metadata importer.
I forgot one file.
Merge branch 'master' into Xcode6
Merge branch 'Xcode6' into moreAgressiveSwift