cleanups and compatibility with indigo-player#14

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mash-graz wants to merge 5 commits into

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mash-graz:master

Commits on Mar 3, 2020

more useful default settings and eleminating the cue identifierers
mur.at ML group
committed
python3 compatibility
mur.at ML group
committed
argparser and eliminating dateutil dependency
mur.at ML group
committed
cleanup -- i.e. remove individual thumbs
mur.at ML group
committed
less verbose output resp. log handling
mur.at ML group
committed