Snapcast 0.16.x features

[uSpike]

Hi, I just wanted to document that there's some new features in snapcast 0.16.0 that would be great to integrate into this project. See https://github.com/badaix/snapcast/blob/master/changelog.md#version-0160

Notable changes:

• Streams can be added and removed
• Group names can be changed

Maybe the control interface could expose additional functionality if the sever version is higher than 0.16.0? I may be able to write up a PR in the next few days.

[happyleavesaoc]

Ability to change group names is a big one, nice.

It's probably sufficient to raise an exception if the server version is not >= 0.16.0.

I welcome a PR. Unfortunately I don't have time in the near future to add support myself.

[markferry]

I started working on this: group-set-name.

[markferry]

#40