Add more formats

[dseomn]

Suggestion

Some song formats I have in my collection that aren't supported yet, I think:

• dwi, e.g., from https://search.stepmaniaonline.net/pack/id/2025. I couldn't find a spec with a quick search, but StepMania has a parser: https://github.com/stepmania/stepmania/blob/5_1-new/src/NotesLoaderDWI.cpp
• ssc, e.g., from https://www.clubfantastic.com/#download

And audio formats:

• opus, e.g., from https://projectoutfox.com/outfox-serenity/volume-i

Use case

No response

Extra info/examples/attachments

If I'm understanding the code correctly, these are the lists of song and audio formats that are already supported, right? https://github.com/performous/performous/blob/baab998042eebc17a352d4542803108eff31a6b7/game/songs.cc#L255 https://github.com/performous/performous/blob/baab998042eebc17a352d4542803108eff31a6b7/game/songparser.cc#L136-L145

[Baklap4]

If I'm understanding the code correctly, these are the lists of song and audio formats that are already supported, right?

You're correct! Would be nice to see a PR following this

[dseomn]

Would be nice to see a PR following this

Yup. This isn't that high of a priority for me at the moment, but I might get around to it at some point if that changes.

[taynaron]

opus support added, the rest is still to-do.