refactor: introcuce Model\Episode::description
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prevent adn module from triggering a post

fixes #141
fix use of deprecated function
adn module: refactorings
PWP update to 2.0.15
possibly fix show-url issue

issue #197
migration assistant: fix firefox issues

fixes #193
update podlove-timeline library

fixes #114
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:shipit: release 1.8.6
improve auphonic workflow

- option to publish when done
- trigger file validation on slug fillin
- option to start production after creation
- split import in results and metata. always autoimport results
- deactivate production buttons instead of hiding them
- after creating: add production to select instantly
- consolidate status windows
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