Implemented layer LED assignment

Added a centralised ProfileEditorSurface for communication between VMs
Prefixed Surface, Device and Led with Artemis to differentiate them better

src/Artemis.Core/Models/Surface/ArtemisSurface.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Artemis.Storage.Entities.Surface;
+using RGB.NET.Core;
+using Stylet;
+
+namespace Artemis.Core.Models.Surface
+{
+    public class ArtemisSurface : PropertyChangedBase
+    {
+        internal ArtemisSurface(RGBSurface rgbSurface, string name, double scale)
+        {
+            SurfaceEntity = new SurfaceEntity {DeviceEntities = new List<DeviceEntity>()};
+            EntityId = Guid.NewGuid();
+
+            Name = name;
+            Scale = scale;
+            RgbSurface = rgbSurface;
+            IsActive = false;
+
+            // Devices are not populated here but as they are detected
+            Devices = new List<ArtemisDevice>();
+
+            ApplyToEntity();
+        }
+
+        internal ArtemisSurface(RGBSurface rgbSurface, SurfaceEntity surfaceEntity, double scale)
+        {
+            SurfaceEntity = surfaceEntity;
+            EntityId = surfaceEntity.Id;
+
+            RgbSurface = rgbSurface;
+            Scale = scale;
+            Name = surfaceEntity.Name;
+            IsActive = surfaceEntity.IsActive;
+
+            // Devices are not populated here but as they are detected
+            Devices = new List<ArtemisDevice>(); 
+        }
+
+        public RGBSurface RgbSurface { get; }
+        public double Scale { get; private set; }
+        public string Name { get; set; }
+        public bool IsActive { get; internal set; }
+        public List<ArtemisDevice> Devices { get; internal set; }
+
+        internal SurfaceEntity SurfaceEntity { get; set; }
+        internal Guid EntityId { get; set; }
+
+        internal void ApplyToEntity()
+        {
+            SurfaceEntity.Id = EntityId;
+            SurfaceEntity.Name = Name;
+            SurfaceEntity.IsActive = IsActive;
+
+            // Add missing device entities, don't remove old ones in case they come back later
+            foreach (var deviceEntity in Devices.Select(d => d.DeviceEntity).ToList())
+            {
+                if (!SurfaceEntity.DeviceEntities.Contains(deviceEntity))
+                    SurfaceEntity.DeviceEntities.Add(deviceEntity);
+            }
+        }
+
+        public void UpdateScale(double value)
+        {
+            Scale = value;
+            foreach (var device in Devices)
+                device.CalculateRenderProperties();
+
+            OnScaleChanged();
+        }
+
+        #region Events
+
+        public event EventHandler<EventArgs> ScaleChanged;
+
+        protected virtual void OnScaleChanged()
+        {
+            ScaleChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        #endregion
+    }
+}