add support for using Stream Deck+ Encoder to change Sonos volume

[indomitableMan]

Added new AdjustVolume action to support using a StreamDeck+ Encoder to adjust volume and mute Sonos system.

[gruen-e]

$ ./DistributionTool -b -i src/com.genericmale.sonos.sdPlugin -o release                                            « ±feat---Add-StreamDeck-Plus-Support ✓
         using printf
         Validating and exporting the plugin src/com.genericmale.sonos.sdPlugin
         Error: The action 'com.genericmale.sonos.adjustvolume' has an "Icon" property with the value 'volumecontrol_action@2x.png' which is not an existing file on disk. Please add a valid value to the property "Icon" in the manifest.json
         Error: The plugin is invalid

Did you create an Icon and didn't commit it?

(Also, THANK YOU FOR THIS)

[indomitableMan]

The icon is one of the existing material design icons that this plug-in already uses. However as noted elsewhere this code is not 100% functional due to a library conflict. I need to perform further work on this code to get it working properly.

[jer78]

@indomitableMan Let me know if you're still working on this and need a tester. I just upgraded to the Stream Deck + today so I can now help beta test.

[indomitableMan]

I am not currently doing any further work on this plug-in. Due to the library conflict and a couple of architectural issues, I think I will start on a new Sonos plug-in exclusively for the Streamdeck+ after the new year.

[jer78]

Ok sounds good. Let me know if I can help sometime in the new year with testing.

[joshferrell]

@GenericMale Is there anything left to do on this plugin where it would be able to get merged?

@indomitableMan otherwise, would you be willing to send your built elgato file? I don't have a windows machine to bundle things.