refactor: break IEssentialsRoom down further

In order to allow for easier composition of interfaces for room plugins, the IEssentialsRoom interface needed to be broken down further to the simplest components a room would need to function. The interfaces are composited in the huddle space and the Huddle VTC interfaces.

essentials-framework/Essentials Core/PepperDashEssentialsBase/Devices/IVolumeAndAudioInterfaces.cs

@@ -72,6 +72,10 @@ namespace PepperDash.Essentials.Core
     {
         IBasicVolumeControls CurrentVolumeControls { get; }
 		event EventHandler<VolumeDeviceChangeEventArgs> CurrentVolumeDeviceChange;
+
+        void SetDefaultLevels();
+
+        bool ZeroVolumeWhenSwtichingVolumeDevices { get; }
 	}