- 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.