* Simplify Manifest data entries
* Map MD and MU tags to genres
* Switch separator for Ignored Groups setting
From comma to newlines for better readability
* Make MU Tags optional via preferences
Because they might contain spoilers.
- Include demographic \ target audience into genres
* Switch from flattening list to a builder
* Remove unneeded Listener
* Switch migration check to preference boolean
Rename muTags parameter to includeMuTags
* Rename a couple variables
More in line with their context
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