Work on project manager and project panel

RainmeterStudio/Utils/DirectoryHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using RainmeterStudio.Model;
+
+namespace RainmeterStudio.Utils
+{
+    public static class DirectoryHelper
+    {
+        public static Tree<Reference> GetFolderTree(string folder)
+        {
+            // Build tree object
+            Reference reference = new Reference(Path.GetFileName(folder), folder);
+            Tree<Reference> tree = new Tree<Reference>(reference);
+
+            // Navigate folder structure
+            if (Directory.Exists(folder))
+            {
+                foreach (var item in Directory.EnumerateDirectories(folder)
+                    .Concat(Directory.EnumerateFiles(folder)))
+                {
+                    tree.Add(GetFolderTree(item));
+                }
+            }
+
+            // Return tree
+            return tree;
+        }
+    }
+}