add the PowerIsOnFeedback back to DisplayBase and marked it Obsolete

essentials-framework/Essentials Core/PepperDashEssentialsBase/Display/BasicIrDisplay.cs

@@ -20,7 +20,8 @@ namespace PepperDash.Essentials.Core
 		public IrOutputPortController IrPort { get; private set; }
 		public ushort IrPulseTime { get; set; }
 
-        public BoolFeedback PowerIsOnFeedback { get; private set; }
+        [Obsolete("This property will be removed")]
+        public override BoolFeedback PowerIsOnFeedback { get; protected set; }
 
         protected Func<bool> PowerIsOnFeedbackFunc
         {

essentials-framework/Essentials Core/PepperDashEssentialsBase/Display/DisplayBase.cs

@@ -22,6 +22,9 @@ namespace PepperDash.Essentials.Core
 	{
         public event SourceInfoChangeHandler CurrentSourceChange;
 
+        [Obsolete("This will be removed soon. Please update references")]
+        public abstract BoolFeedback PowerIsOnFeedback { get; protected set; }
+
         public string CurrentSourceInfoKey { get; set; }
         public SourceListItem CurrentSourceInfo
         {
@@ -261,7 +264,7 @@ namespace PepperDash.Essentials.Core
 
         abstract protected Func<string> CurrentInputFeedbackFunc { get; }
 
-        public BoolFeedback PowerIsOnFeedback { get; protected set; }
+        public override BoolFeedback PowerIsOnFeedback { get; protected set; }
         abstract protected Func<bool> PowerIsOnFeedbackFunc { get; }