Major changes in 1.20.3
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* Fix several memory leaks
* afc: Force unmount properly
* afc: Add version detection for newer iOS
* afp: Fix a race that caused hangs
* afp & ftp: Handle idle connections better
* ftp: Fix CHMOD against some servers
* archive: Fix a couple of segfaults on certain archives
* gphoto: Set mtime when copying to a local disk
* Several smaller bugfixes