Also added the default ConbfigDb to serve as a clean start point.

- State machine checks for properties that get their values from the OPC server.
- Refactored attribute names to be all lower case.
- Got rid of the two functions that enable/disable data fetching in the data thread.

Still mostly templates.

Thanks, Python3, for still being a Pita.

Also remove all the locking that somehow blocked the entire Python program.

The attributes cannot be used before they get written to or otherwise
somehow magically updated.  Therefore I added peoprties with default
values that I assign in the init_device method.

The devices that run in this device server connect to OPC-UA servers
that provide crosslet station stats.

And thanks to Leon for pointing out the hidden GPL file.

The Python modules that the device depends on have to be
specified in the file requirements.txt in the same path
of the device.

Still not there because docker-compose appears to do some
things behind closed doors and I cannot figure them out yet.