(prop) Canonical property storage

[Robert Scholte]

FYI: A discussion has started on core-libs-dev mailinglist[1] about 
extending java.util.Properties with methods to store  properties files 
in a reproducible way.
If you have any comments, subscribe to the mailinglist[2] or ask me to 
drop the comments.

thanks,
Robert
[1] 
https://mail.openjdk.java.net/pipermail/core-libs-dev/2021-August/080758.html
[2] https://mail.openjdk.java.net/mailman/listinfo/core-libs-dev