feat(SigCommands): #759 Adds SigCommand concept for each data type

essentials-framework/Essentials Core/PepperDashEssentialsBase/SigCommands/SigCommandBase.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+using PepperDash.Core;
+
+namespace PepperDash.Essentials.Core
+{
+    /// <summary>
+    /// A helper class to make it easier to work with Crestron Sigs
+    /// </summary>
+    public abstract class SigCommandBase : IKeyed
+    {
+
+        public string Key { get; private set; }  
+
+        /// <summary>
+		/// Base Constructor - empty
+		/// </summary>
+		protected SigCommandBase()
+		{
+		}
+
+        protected SigCommandBase(string key)
+        {
+            if (key == null)
+                Key = "";
+            else
+                Key = key;
+        }
+
+        /// <summary>
+        /// Computes the value by running the ValueFunc and if the value has changed, updates the linked sigs and fires the OnOutputChange event
+        /// </summary>
+        public abstract void FireUpdate();
+
+        /// <summary>
+        /// Fires the update asynchronously within a CrestronInvoke
+        /// </summary>
+        public void InvokeFireUpdate()
+        {
+            CrestronInvoke.BeginInvoke(o => FireUpdate());
+        }
+    }
+}