refactor: rearrange and add solution for 4-series

src/PepperDash.Essentials.Core/Feedbacks/FeedbackCollection.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Core
+{
+    /// <summary>
+    /// Basically a List , with an indexer to find feedbacks by key name
+    /// </summary>
+    public class FeedbackCollection<T> : List<T> where T : Feedback
+    {
+        /// <summary>
+        /// Case-insensitive port lookup linked to feedbacks' keys
+        /// </summary>
+        public T this[string key]
+        {
+            get
+            {
+                return this.FirstOrDefault(i => i.Key.Equals(key, StringComparison.OrdinalIgnoreCase));
+            }
+        }
+    }
+}