WIP - moving tree and section service implementations to Web because they are web based and they need web based objects, there's no sense in coying all of the non-web objects to Core. Now we need to use IoC for the ServiceContext

src/Umbraco.Web/Models/Trees/ApplicationAttribute.cs

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+using System;
+
+namespace Umbraco.Web.Models.Trees
+{
+    /// <summary>
+    /// Identifies an application tree
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
+    public class ApplicationAttribute : Attribute
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ApplicationAttribute"/> class.
+        /// </summary>
+        /// <param name="alias">The alias.</param>
+        /// <param name="name">The name.</param>
+        /// <param name="icon">The icon.</param>
+        /// <param name="sortOrder">The sort order.</param>
+        public ApplicationAttribute(string alias,
+            string name,
+            string icon,
+            int sortOrder = 0)
+        {
+            Alias = alias;
+            Name = name;
+            Icon = icon;
+            SortOrder = sortOrder;
+        }
+
+        public string Alias { get; private set; }
+        public string Name { get; private set; }
+        public string Icon { get; private set; }
+        public int SortOrder { get; private set; }
+    }
+}

src/Umbraco.Web/Models/Trees/ApplicationDefinitions.cs

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+using Umbraco.Core;
+using Umbraco.Core.Models;
+
+namespace Umbraco.Web.Models.Trees
+{
+    // The application definitions are intended as a means to auto populate
+    // the application.config. On app startup, Umbraco will look for any
+    // unregistered classes with an ApplicationAttribute and add them to the cache
+
+    [Application(Constants.Applications.Content, "Content", ".traycontent")]
+    public class ContentApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Media, "Media", ".traymedia", sortOrder: 1)]
+    public class MediaApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Settings, "Settings", ".traysettings", sortOrder: 2)]
+    public class SettingsApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Developer, "Developer", ".traydeveloper", sortOrder: 3)]
+    public class DeveloperApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Users, "Users", ".trayusers", sortOrder: 4)]
+    public class UsersApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Members, "Members", ".traymember", sortOrder: 5)]
+    public class MembersApplicationDefinition : IApplication
+    { }
+
+    [Application(Constants.Applications.Translation, "Translation", ".traytranslation", sortOrder: 6)]
+    public class TranslationApplicationDefinition : IApplication
+    { }
+}