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

PckStudio.Core/Extensions/TreeViewExtensions.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Linq;
+using System.Windows.Forms;
+
+namespace PckStudio.Core.Extensions
+{
+    public static class TreeViewExtensions
+    {   
+        public static TreeNode[] FindPath(this TreeView treeView, string path)
+        {
+            if (string.IsNullOrWhiteSpace(path))
+                return Array.Empty<TreeNode>();
+
+            if (!path.Contains(treeView.PathSeparator))
+            {
+                return treeView.Nodes.Find(path, false);
+            }
+
+            string segment = path.Substring(0, path.IndexOf(treeView.PathSeparator));
+            if (treeView.Nodes.ContainsKey(segment))
+            {
+                TreeNode[] res = treeView.Nodes[segment].GetChildNodes().Where(node => node.FullPath == path).ToArray();
+                return res;
+            }
+            return Array.Empty<TreeNode>();
+        }
+    }
+}