Add config for workers
The backend of a worker is currently hardcoded to
Also some workers need specific configuration - eg.
HWSLOT variable set - and each worker needs it's own value.
Therefore I will add a configuration file in
will define the
BACKEND variable as well as other vars for each
To prevent breaking existing setups, the file will only be read in, if it
exists and if there is no config for a worker, the
BACKEND will default