Please add autoadd function for genre

[jraphael11]

I convert all genre via genrecsv. I use this function as translator.
So, I want to know which genre item is not converted in my library.
If you add autoadd function for genre like thumbcsv, I think I can that work easily.

[jvlflame]

Great suggestion! Surprisingly, I have never thought to utilize the genre csv for this purpose but it actually makes perfect sense.
I'll add this to my backlog for the next release.

[jvlflame]

Added boolean setting sort.metadata.genrecsv.autoadd to add new genres to the genre csv automatically (does not rely on sort.metadata.genrecsv).

If sort.metadata.genrecsv is true, functionality has been updated to not perform a replacement if the Replacement csv field is null or empty.