Provide a GUI for setup of resconfig and qadapter

Changes:

1. If resconfig is not found then show button "create resconfig". This step must succeed independent on what host the session is running (cluster with slurm, workstation or local laptop/desktop).
2. The selection of worker appears. The worker name selector should be a combo box, no free text input field.
3. Add a checkbox for unique_launchdir. Default: checked (True)

The qadapter does not need explicit change in the GUI because if no file is selected then None will be passed to WFEngine class and a default qadapter will be created from resconfig. If qadapter cannot be created from resconfig (for example, due to lack of slurm queues) then None will be configured and only interactive nodes will be excuted.