extend update script or make new: workflow template

[ptrebert]

We also need the possibility to update other templates such as the Snakemake workflow template. The functionality is essentially identical, so it could all be merged at some point. For the time being, I guess the easier solution is to implement that functionality in a separate script and aim for a more abstracted code base in the long-term. Please move both scripts into a folder named devtools/ in the repository.

[svenwillger]

A separate branch "add-update-workflow" was created and the scripts "update_metadata.py" and "update.workflow.py" are located respectively in the folder named cubi-tools/.