Storage - Use nullable reference types

Core - Fix build warnings

src/Artemis.Core/Models/Profile/Layer.cs

@@ -248,8 +248,8 @@ public sealed class Layer : RenderProfileElement
             typeof(PropertyGroupDescriptionAttribute)
         )!;
 
-        LayerEntity.GeneralPropertyGroup ??= new PropertyGroupEntity {Identifier = generalAttribute.Identifier};
-        LayerEntity.TransformPropertyGroup ??= new PropertyGroupEntity {Identifier = transformAttribute.Identifier};
+        LayerEntity.GeneralPropertyGroup ??= new PropertyGroupEntity {Identifier = generalAttribute.Identifier!};
+        LayerEntity.TransformPropertyGroup ??= new PropertyGroupEntity {Identifier = transformAttribute.Identifier!};
 
         General.Initialize(this, null, generalAttribute, LayerEntity.GeneralPropertyGroup);
         Transform.Initialize(this, null, transformAttribute, LayerEntity.TransformPropertyGroup);

src/Artemis.Core/Models/Profile/LayerPropertyGroup.cs

@@ -240,7 +240,8 @@ public abstract class LayerPropertyGroup : IDisposable
         foreach (LayerPropertyGroup layerPropertyGroup in LayerPropertyGroups)
         {
             layerPropertyGroup.ApplyToEntity();
-            PropertyGroupEntity.PropertyGroups.Add(layerPropertyGroup.PropertyGroupEntity);
+            if (layerPropertyGroup.PropertyGroupEntity != null)
+                PropertyGroupEntity.PropertyGroups.Add(layerPropertyGroup.PropertyGroupEntity);
         }
     }
 

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

@@ -46,7 +46,7 @@ public class ArtemisDevice : CorePropertyChanged
         InputIdentifiers = new List<ArtemisDeviceInputIdentifier>();
         InputMappings = new Dictionary<ArtemisLed, ArtemisLed>();
         Categories = new HashSet<DeviceCategory>();
-        LayoutSelection = new LayoutSelection {Type = DefaultLayoutProvider.LayoutType};
+        LayoutSelection = new LayoutSelection {Type = DefaultLayoutProvider.LAYOUT_TYPE};
 
         RgbDevice.ColorCorrections.Clear();
         RgbDevice.ColorCorrections.Add(new ScaleColorCorrection(this));
@@ -75,7 +75,7 @@ public class ArtemisDevice : CorePropertyChanged
         InputIdentifiers = new List<ArtemisDeviceInputIdentifier>();
         InputMappings = new Dictionary<ArtemisLed, ArtemisLed>();
         Categories = new HashSet<DeviceCategory>();
-        LayoutSelection = new LayoutSelection {Type = DefaultLayoutProvider.LayoutType};
+        LayoutSelection = new LayoutSelection {Type = DefaultLayoutProvider.LAYOUT_TYPE};
 
         foreach (DeviceInputIdentifierEntity identifierEntity in DeviceEntity.InputIdentifiers)
             InputIdentifiers.Add(new ArtemisDeviceInputIdentifier(identifierEntity.InputProvider, identifierEntity.Identifier));
@@ -155,6 +155,9 @@ public class ArtemisDevice : CorePropertyChanged
     /// </summary>
     public HashSet<DeviceCategory> Categories { get; }
 
+    /// <summary>
+    ///     Gets the layout selection applied to this device
+    /// </summary>
     public LayoutSelection LayoutSelection { get; }
 
     /// <summary>

src/Artemis.Core/Models/Surface/Layout/ArtemisLayout.cs

@@ -57,6 +57,9 @@ public class ArtemisLayout
     /// </summary>
     public LayoutCustomDeviceData LayoutCustomDeviceData { get; private set; } = null!;
 
+    /// <summary>
+    ///     Gets a boolean indicating whether this layout is a default layout or not
+    /// </summary>
     public bool IsDefaultLayout { get; private set; }
 
     /// <summary>