Make Apple Keychain format more robust

[kholia]

Closes #3408

This only took 14 years (after the initial format release in 2012)...

CC @magnumripper @solardiz

[solardiz]

Thank you very much @kholia. I don't have time to look at this for real now - hopefully soon. Meanwhile, you could want to see why two CI jobs are failing here.

[kholia]

The CI infrastructure is running into problems:

Configure finished.  Now "make -s clean && make -sj2" to compile.
The authenticity of host 'github.com (140.82.112.3)' can't be established.
ED25519 key fingerprint is SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? make[1]: *** Deleting file 'misc.o'
make[1]: *** Deleting file 'memory.o'
make[1]: *** Deleting file 'mask.o'
make[1]: *** Deleting file 'loader.o'
make: *** [Makefile:202: default] Hangup

Too long with no output (exceeded 10m0s): context deadline exceeded

[magnumripper]

Why the name change for keypass2john.py? In general that is messy and can lead to problems in some setups. Did syntax/options change?

[kholia]

Good point. I believe we can keep the same name as the script is mostly backwards compatible.