Move python things to pyomftools

[katajakasa]

Move python scripts and tags.csv to pyomftools. That way we can keep them up-to-date and working, and manage the environment better.

See:

• https://github.com/omf2097/pyomftools/blob/master/omftools/resources/tags.csv
• https://github.com/omf2097/pyomftools/blob/master/omftools/cli/tags.py