[Feature Request] Support comma separated range list in RangeParser

[JohannesKlauss]

Currently you can parse one range string like

assert_eq!(RangeParser::parse_one("KK+").unwrap().len(), 12)

I'd like to have the ability to parse a broader range string, something like JJ+, A2s+:

assert_eq!(RangeParser::parse_one("KK+,A2s+").unwrap().len(), 60)

Or a bit more complicated

assert_eq!(RangeParser::parse_one("AK-87s,A2s+").unwrap().len(), 72)

Since AK-87s overlaps AKs with A2s+ it would need to look out for duplicates.

Do you feel this could be a useful addition?