Adds PresetBase class and new IHasCameraPresets interface

PepperDashEssentials/AppServer/Messengers/CameraBaseMessenger.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.AppServer.Messengers
+{
+    public class CameraBaseMessenger
+    {
+    }
+}

essentials-framework/Essentials Core/PepperDashEssentialsBase/Presets/PresetBase.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+using Newtonsoft.Json;
+
+namespace PepperDash.Essentials.Core.Presets
+{
+    public class PresetBase
+    {
+        [JsonProperty("id")]
+        public int ID { get; set; }
+        /// <summary>
+        /// Used to store the name of the preset
+        /// </summary>
+        [JsonProperty("description")]
+        public string Description { get; set; }
+        /// <summary>
+        /// Indicates if the preset is defined(stored) in the codec
+        /// </summary>
+        [JsonProperty("defined")]
+        public bool Defined { get; set; }
+        /// <summary>
+        /// Indicates if the preset has the capability to be defined
+        /// </summary>
+        [JsonProperty("isDefinable")]
+        public bool IsDefinable { get; set; }
+
+        public PresetBase(int id, string description, bool def, bool isDef)
+        {
+            ID = id;
+            Description = description;
+            Defined = def;
+            IsDefinable = isDef;
+        }
+    }
+}

essentials-framework/Essentials Devices Common/Essentials Devices Common/Cameras/IHasCameraPresets.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Devices.Common.Cameras
+{
+    /// <summary>
+    /// Describes a camera with preset functionality
+    /// </summary>
+    public interface IHasCameraPresets
+    {
+        event EventHandler<EventArgs> PresetsListHasChanged;
+
+        List<CameraPreset> Presets { get; }
+
+        void PresetSelect(int preset);
+
+        void PresetStore(int preset, string description);
+    }
+}