Major changes in 1.21.3
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* afc: Implement standard::allocated-size
* smb: Implement standard::allocated-size
* afp: Report number of bytes copied
* afc: Work-around mounts not disappearing when disconnecting device
* afc: Add version detection for iOS 6, 7 and 8
* metadata: Fix misaligned accesses to 64bit data
* Several smaller bugfixes
* Translation updates