Find and implement missing Metadata tags #118
Description
Look through https://github.com/TheNathannator/GuitarGame_ChartFormats for missed chart or ini tags relevant to Guitar Hero, Rock Band, Clone Hero or YARG and note them in the comments of this issue.
Once #109 is resolved, implement these tags with the attribute and/or manual conversion in the mapper classes. For tags with predefined valid values, use an enum representation.
Finally, add some unit tests for manually mapped tags.