UI - Added Avalonia projects

src/Artemis.Core/Models/Profile/LayerProperties/LayerProperty.cs

@@ -44,7 +44,7 @@ namespace Artemis.Core
                 _baseValue = default!;
 
             _keyframes = new List<LayerPropertyKeyframe<T>>();
-            Keyframes = new(_keyframes);
+            Keyframes = new ReadOnlyCollection<LayerPropertyKeyframe<T>>(_keyframes);
         }
 
         /// <summary>

src/Artemis.Core/Models/Profile/LayerProperties/LayerPropertyKeyFrame.cs

@@ -66,7 +66,7 @@ namespace Artemis.Core
         /// <inheritdoc />
         public KeyframeEntity GetKeyframeEntity()
         {
-            return new()
+            return new KeyframeEntity
             {
                 Value = CoreJson.SerializeObject(Value),
                 Position = Position,