Split into smaller projects, now uses plugins.

RainmeterStudio.Core/Storage/IDocumentStorage.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Storage
+{
+    public interface IDocumentStorage
+    {
+        /// <summary>
+        /// Reads a document from file
+        /// </summary>
+        /// <param name="path">Path to file</param>
+        /// <returns>Read document</returns>
+        IDocument Read(string path);
+
+        /// <summary>
+        /// Writes a document to a file
+        /// </summary>
+        /// <param name="path">Path to file</param>
+        /// <param name="document">Document to write</param>
+        void Write(string path, IDocument document);
+
+        /// <summary>
+        /// Tests if the file can be read by this storage
+        /// </summary>
+        /// <param name="path">Path to file</param>
+        /// <returns>True if file can be read</returns>
+        bool CanRead(string path);
+
+        /// <summary>
+        /// Tests if the document can be written by this storage
+        /// </summary>
+        /// <param name="documentType">Document type</param>
+        /// <returns>True if the document can be written</returns>
+        bool CanWrite(Type documentType);
+    }
+}

RainmeterStudio.Core/Storage/SerializableTree.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Storage
+{
+    /// <summary>
+    /// A special type of tree that implements a very small subset of tree operations, and can be serialized
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class SerializableTree<T>
+    {
+        /// <summary>
+        /// Gets or sets the attached data
+        /// </summary>
+        [XmlElement("data")]
+        public T Data { get; set; }
+
+        /// <summary>
+        /// Gets or sets the list of children
+        /// </summary>
+        [XmlArray("children"), XmlArrayItem("child")]
+        public List<SerializableTree<T>> Children { get; set; }
+
+        /// <summary>
+        /// Initializes the serializable tree
+        /// </summary>
+        public SerializableTree()
+        {
+            Children = new List<SerializableTree<T>>();
+            Data = default(T);
+        }
+
+        /// <summary>
+        /// Initializes the serializable tree with specified data
+        /// </summary>
+        /// <param name="data">Data</param>
+        public SerializableTree(T data)
+        {
+            Children = new List<SerializableTree<T>>();
+            Data = data;
+        }
+    }
+
+    /// <summary>
+    /// Extension methods for converting to and from serializable trees
+    /// </summary>
+    public static class SerializableTreeExtensions
+    {
+        /// <summary>
+        /// Converts tree into a serializable tree
+        /// </summary>
+        /// <typeparam name="T">Data type of tree</typeparam>
+        /// <param name="root">Root node</param>
+        /// <returns>Serializable tree</returns>
+        public static SerializableTree<T> AsSerializableTree<T>(this Tree<T> root)
+        {
+            // Convert current node
+            SerializableTree<T> sRoot = new SerializableTree<T>(root.Data);
+
+            // Add children
+            foreach (var child in root.Children)
+                sRoot.Children.Add(AsSerializableTree(child));
+
+            // Return root
+            return sRoot;
+        }
+
+        /// <summary>
+        /// Converts serializable tree into a tree
+        /// </summary>
+        /// <typeparam name="T">Data type of tree</typeparam>
+        /// <param name="root">Root node</param>
+        /// <returns>Tree</returns>
+        public static Tree<T> AsTree<T>(this SerializableTree<T> root)
+        {
+            // Convert current node
+            Tree<T> sRoot = new Tree<T>(root.Data);
+
+            // Add children
+            foreach (var child in root.Children)
+                sRoot.Add(AsTree(child));
+
+            // Return root
+            return sRoot;
+        }
+    }
+}