Unpack zwf files

[halamix2]

• add basic optional linting workflow
• automatic dependency bumps
• zbm: remove unused code (packer stub)
• add zwf unpacker - it can unpack all existing .zwf files to .wav files

[namgo]

This looks awesome, merging!

As per your comment in discord about code quality, working with binary data nicely in any language is hard, I wouldn't worry about it too much!