Darwin/OSX support

[200sc]

I don't have a way to test on Darwin in the first place right now, so this will be on hold until that changes or someone who can test it can take this over.

[peterhellberg]

Not sure if related, but I'm seeing the following errors when getting the audio package under macOS:

$ go get -u -v github.com/200sc/klangsynthese/audio
github.com/200sc/klangsynthese (download)
github.com/200sc/klangsynthese/audio
# github.com/200sc/klangsynthese/audio
../../../../200sc/klangsynthese/audio/encoding.go:18: undefined: EncodeBytes
../../../../200sc/klangsynthese/audio/encoding.go:23: undefined: EncodeBytes
../../../../200sc/klangsynthese/audio/format.go:28: undefined: EncodeBytes

These errors also show up when installing oak: oakmound/oak#15

[200sc]

Right, we currently don't even have a placeholder structure that would just return "not supported" errors for playing on osx. For oak, I believe there are bugs in shiny that prevent at least some portion of support for osx, but I can fix the placeholder issue here.

[200sc]

@peterhellberg Give it a try with that merge?

[peterhellberg]

Yes, your changes did the trick.

~/Go/src/github.com/200sc
$ rm -rf klangsynthese/
~/Go/src/github.com/200sc
$ go get -u -v github.com/200sc/klangsynthese/audio
github.com/200sc/klangsynthese (download)
github.com/200sc/klangsynthese/audio/filter/supports
github.com/200sc/klangsynthese/audio
~/Go/src/github.com/200sc

[200sc]

Great! Thanks for the report. (This is still open, because we still don't support playback)