feat(essentials): #830 Adds new Cisco features

Adds IHasDoNotDisturbMode, IHasStandbyMode and IHasHalfWakeMode interfaces.
Implements all interfaces on CiscoSparkCodec class.
Adds CiscoCodecJoinMap to allow for bridging new Cisco specific functions.

essentials-framework/Essentials Devices Common/Essentials Devices Common/VideoCodec/Interfaces/IHasStandbyMode.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+using PepperDash.Essentials.Core;
+
+namespace PepperDash.Essentials.Devices.Common.VideoCodec
+{
+    /// <summary>
+    /// Describes a device that has Standby Mode capability
+    /// </summary>
+    public interface IHasStandbyMode
+    {
+        BoolFeedback StandbyIsOnFeedback { get; }
+
+        void StandbyActivate();
+
+        void StandbyDeactivate();
+    }
+
+    /// <summary>
+    /// Describes a device that has Half Waek Mode capability
+    /// </summary>
+    public interface IHasHalfWakeMode : IHasStandbyMode
+    {
+        BoolFeedback HalfWakeModeIsOnFeedback { get; }
+
+        void HalfwakeActivate();
+    }
+}