Move Common functionality to Core project & rendering and Model support as well

PckStudio.Core/Extensions/TreeNodeExtensions.cs

@@ -0,0 +1,47 @@
+using System.Collections.Generic;
+using System.Windows.Forms;
+
+namespace PckStudio.Core.Extensions
+{
+    public static class TreeNodeExtensions
+    {
+        public static bool IsTagOfType<T>(this TreeNode node) where T : class
+        {
+            return node?.Tag is T;
+        }
+
+        public static bool TryGetTagData<TOut>(this TreeNode node, out TOut tagData) where TOut : class
+        {
+            if (node?.Tag is TOut data)
+            {
+                tagData = data;
+                return true;
+            }
+            tagData = default;
+            return false;
+        }
+
+        public static bool Contains(this TreeNode thisNode, TreeNode childNode)
+        {
+            if (childNode.Parent == null)
+                return false;
+            if (thisNode.Equals(childNode.Parent))
+                return true;
+            // If the parent node is not equal to the first node,
+            // call the TreeNode.Contains recursively using the parent of the node.
+            return thisNode.Contains(childNode.Parent);
+        }
+
+        public static List<TreeNode> GetChildNodes(this TreeNode thisNode)
+        {
+            List<TreeNode> nodes = new List<TreeNode>(thisNode.Nodes.Count);
+            foreach (TreeNode node in thisNode.Nodes)
+            {
+                nodes.Add(node);
+                nodes.AddRange(node.GetChildNodes());
+            }
+            return nodes;
+        }
+
+    }
+}