macosx: Upgrade xib files from IB 3 to IB 4-6 format
This makes usage of the old Xcode 3 and Interface Builder 3 obsolete. All further changes need to happen in Xcode >= 4. BGHUDAppkit elements were preserved, but for further changes the respective subclass for the views need to be set manually. Also resyncs all xibs with the source files.
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