simple CLI to convert schematic into netlist
[cli] bypass reading of diagrams and paitings

This might be a problem if later on someonw wants to print the
schematic to pdf for instance.
[cli] add nodeset to netlist
fix newline
[cli] fix handling of subcircuit
cli: cleanup commands, similar to qucsator

Also cleaned trailling white spaces
[cli] fix workdir on loading schematic into GUI