Upgrade to Steam Audio 4.7.0

[JamDoggie]

New steam audio release as of August 11th, so these bindings are out of date.

[ZheYinX]

Yes, I don't know how we can use this project to generate a new version of SteamAudio Net binding library?

[ZheYinX]

I'm a bit clumsy, now I seem to understand how to update, but I haven't fully tested whether it works properly yet!