* there are two king of administrators: those that have many
of the privilegies and the user that are pointed in config file,
auth_rx never initialized this from zero cos always assumed
a starting point as migration, so never need or really detect
who are the admin of the server, cos after migration the admin
already has previous privilegies from plain db file.
* override all the possible handlers with right detection of the
admin user from the config file, on admin detected, no matter
what .. give it all the (on fly) privilegies currently on server
* still a privilegied user at this commit can erase the admin
or change the password if have also enought privilegies
* WARNING: this commit will depends of the previusly commit
as of 2aef6adf19 for right
admin name detection.
* fix engine detection for 5.4 due callbacks handler
* wrongly invoked register_on_authplayer over 5.0+ engines
