Profiles - Only load nodes after the entire profile structure loaded

Profiles - Added API to get all render elements
Nodes - Added layer property node

src/Artemis.VisualScripting/Nodes/CustomViewModels/LayerPropertyNodeCustomViewModel.cs

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+using System.Collections.Generic;
+using System.Linq;
+using Artemis.Core;
+using Stylet;
+
+namespace Artemis.VisualScripting.Nodes.CustomViewModels
+{
+    public class LayerPropertyNodeCustomViewModel : CustomNodeViewModel
+    {
+        private readonly LayerPropertyNode _node;
+
+        private RenderProfileElement _selectedProfileElement;
+        private ILayerProperty _selectedLayerProperty;
+
+        public LayerPropertyNodeCustomViewModel(LayerPropertyNode node) : base(node)
+        {
+            _node = node;
+        }
+
+        public BindableCollection<RenderProfileElement> ProfileElements { get; } = new();
+
+        public RenderProfileElement SelectedProfileElement
+        {
+            get => _selectedProfileElement;
+            set
+            {
+                if (!SetAndNotify(ref _selectedProfileElement, value)) return;
+                _node.ChangeProfileElement(_selectedProfileElement);
+                GetLayerProperties();
+            }
+        }
+
+        public BindableCollection<ILayerProperty> LayerProperties { get; } = new();
+
+        public ILayerProperty SelectedLayerProperty
+        {
+            get => _selectedLayerProperty;
+            set
+            {
+                if (!SetAndNotify(ref _selectedLayerProperty, value)) return;
+                _node.ChangeLayerProperty(_selectedLayerProperty);
+            }
+        }
+
+        private void GetProfileElements()
+        {
+            ProfileElements.Clear();
+            if (_node.Script.Context is not Profile profile) 
+                return;
+
+            List<RenderProfileElement> elements = new(profile.GetAllRenderElements());
+            
+            ProfileElements.AddRange(elements.OrderBy(e => e.Order));
+            _selectedProfileElement = _node.ProfileElement;
+            NotifyOfPropertyChange(nameof(SelectedProfileElement));
+        }
+
+        private void GetLayerProperties()
+        {
+            LayerProperties.Clear();
+            if (_node.ProfileElement == null)
+                return;
+
+            LayerProperties.AddRange(_node.ProfileElement.GetAllLayerProperties().Where(l => l.GetAllDataBindingRegistrations().Any()));
+            _selectedLayerProperty = _node.LayerProperty;
+            NotifyOfPropertyChange(nameof(SelectedLayerProperty));
+        }
+
+        #region Overrides of CustomNodeViewModel
+
+        /// <inheritdoc />
+        protected override void OnDisplay()
+        {
+            GetProfileElements();
+            GetLayerProperties();
+        }
+
+        #endregion
+    }
+}