Split into smaller projects, now uses plugins.

RainmeterStudio.Core/Documents/DocumentEditorFeatures/ICustomDocumentTitleProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace RainmeterStudio.Core.Documents.DocumentEditorFeatures
+{
+    public interface ICustomDocumentTitleProvider
+    {
+        string Title { get; }
+        event EventHandler TitleChanged;
+    }
+}

RainmeterStudio.Core/Documents/DocumentEditorFeatures/ISelectionPropertiesProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Documents.DocumentEditorFeatures
+{
+    interface ISelectionPropertiesProvider
+    {
+        string SelectionName { get; }
+        IEnumerable<Property> SelectionProperties { get; }
+
+        event EventHandler SelectionChanged;
+    }
+}

RainmeterStudio.Core/Documents/DocumentEditorFeatures/IToolboxProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace RainmeterStudio.Core.Documents.DocumentEditorFeatures
+{
+    public interface IToolboxProvider
+    {
+        bool SupportsToolboxDrop { get; }
+        IEnumerable<string> ToolboxItems { get; }
+
+        event EventHandler ToolboxItemsChanged;
+    }
+}

RainmeterStudio.Core/Documents/DocumentEditorFeatures/IUndoSupport.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace RainmeterStudio.Core.Documents.DocumentEditorFeatures
+{
+    public interface IUndoSupport
+    {
+        // TODO
+    }
+}

RainmeterStudio.Core/Documents/DocumentTemplate.cs

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+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Documents
+{
+    /// <summary>
+    /// Represents a document template
+    /// </summary>
+    public abstract class DocumentTemplate
+    {
+        /// <summary>
+        /// Gets the document template name
+        /// </summary>
+        public string Name { get; private set; }
+
+        /// <summary>
+        /// Gets the default extension of this template
+        /// </summary>
+        public string DefaultExtension { get; private set; }
+
+        /// <summary>
+        /// Initializes the document template
+        /// </summary>
+        /// <param name="name">Name of template</param>
+        /// <param name="defaultExtension">Default extension</param>
+        public DocumentTemplate(string name, string defaultExtension)
+        {
+            Name = name;
+            DefaultExtension = defaultExtension;
+        }
+
+        /// <summary>
+        /// Creates a document using this template
+        /// </summary>
+        /// <returns></returns>
+        public abstract IDocument CreateDocument();
+    }
+}

RainmeterStudio.Core/Documents/IDocumentEditor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Documents
+{
+    /// <summary>
+    /// A document editor
+    /// </summary>
+    public interface IDocumentEditor
+    {
+        /// <summary>
+        /// Gets the document attached to this editor instance
+        /// </summary>
+        IDocument AttachedDocument { get; }
+        
+        /// <summary>
+        /// Gets the UI control to display for this editor
+        /// </summary>
+        UIElement EditorUI { get; }
+    }
+}

RainmeterStudio.Core/Documents/IDocumentEditorFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using RainmeterStudio.Core.Model;
+
+namespace RainmeterStudio.Core.Documents
+{
+    public interface IDocumentEditorFactory
+    {
+        /// <summary>
+        /// Creates a new editor object
+        /// </summary>
+        /// <param name="document">Document to be edited by the editor</param>
+        /// <returns>A new document editor</returns>
+        IDocumentEditor CreateEditor(IDocument document);
+
+        /// <summary>
+        /// Tests if this editor can edit this document type
+        /// </summary>
+        /// <param name="type">Document type</param>
+        /// <returns>True if the editor can edit the document type</returns>
+        bool CanEdit(Type type);
+    }
+}