Replace our own serializer by JSON in Conf/File.pm
We use our own serializing system for configurations which is not readable by anything else. It is also more verbose and less secure than standards one like JSON which is run by JSON::XS by default. I think we could replace this easily. {{load()}} will first read the first char to know if it's JSON or old format.
Just a problem, some of our keys are a little strange like rules. We could perhaps replace them by
[ {k => '^/admin', 'r => '$uid =~/^admin/', comment => 'Admin tree' } ]
So they could be ordered (by drag/drop in manager for example) and best seen. Common/Conf will study this key to transform it if in old format.