feat(essentails): #869 Adds Apple TV Driver

hotfix(Essentials_DM): fixed invalid cast exception in dm blade chassis

PepperDashEssentials/Room/Types/EssentialsHuddleVtc1Room.cs

@@ -214,17 +214,25 @@ namespace PepperDash.Essentials
 
                 VideoCodec = DeviceManager.GetDeviceForKey(PropertiesConfig.VideoCodecKey) as
                     PepperDash.Essentials.Devices.Common.VideoCodec.VideoCodecBase;
-				
+
 
                 if (VideoCodec == null)
-                    throw new ArgumentNullException("codec cannot be null");
-				
+                {
+                    Debug.Console(0, Debug.ErrorLogLevel.Error, "No Video Codec set.  Please check 'videoCodecKey' property in room config");
+                    throw new ArgumentNullException("VideoCodec cannot be null");
+                }
+
                 AudioCodec = DeviceManager.GetDeviceForKey(PropertiesConfig.AudioCodecKey) as
                     PepperDash.Essentials.Devices.Common.AudioCodec.AudioCodecBase;
                 if (AudioCodec == null)
                     Debug.Console(0, this, "No Audio Codec Found");
 
                 DefaultAudioDevice = DeviceManager.GetDeviceForKey(PropertiesConfig.DefaultAudioKey) as IBasicVolumeControls;
+                if (DefaultAudioDevice == null)
+                {
+                    Debug.Console(0, Debug.ErrorLogLevel.Error, "No Default Audio Device set.  Please check 'defaultAudioKey' property in room config");
+                    throw new ArgumentNullException("DefaultAudioDevice cannot be null");
+                }
 
                 InitializeRoom();
             }

essentials-framework/Essentials DM/Essentials_DM/Chassis/DmBladeChassisController.cs

@@ -304,7 +304,7 @@ namespace PepperDash.Essentials.DM {
         {
             var newEvent = NumericSwitchChange;
             if (newEvent != null) newEvent(this, e);
-        }
+        }
 
 
         void AddHdmiInBladePorts(uint number, ICec cecPort) {
@@ -425,7 +425,7 @@ namespace PepperDash.Essentials.DM {
             Debug.Console(2, this, "Adding output port '{0}'", portKey);
             OutputPorts.Add(new RoutingOutputPort(portKey, sigType, portType, selector, this)
             {
-                FeedbackMatchObject = Chassis.Outputs[(uint)selector]
+                FeedbackMatchObject = selector
             });
         }
 

essentials-framework/Essentials Devices Common/Essentials Devices Common/Streaming/AppleTV.cs

@@ -19,7 +19,7 @@ namespace PepperDash.Essentials.Devices.Common
 	public class AppleTV : EssentialsBridgeableDevice, IDPad, ITransport, IUiDisplayInfo, IRoutingOutputs
 	{
 		public IrOutputPortController IrPort { get; private set; }
-		public const string StandardDriverName = "Apple AppleTV-v2.ir";
+        public const string StandardDriverName = "Apple_AppleTV_4th_Gen_Essentials.ir";
 		public uint DisplayUiType { get { return DisplayUiConstants.TypeAppleTv; } }
 
 		public AppleTV(string key, string name, IrOutputPortController portCont)