Fixes up the starter kit installer in the back office with it's legacy implementation. Adds some handy methods for webapi routing for areas.

src/Umbraco.Web/Install/Models/InstallPackageModel.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Umbraco.Web.Install.Models
+{
+
+    [Obsolete("This is only used for the obsolete controller InstallPackageController")]
+    [DataContract(Name = "installPackage", Namespace = "")]
+    public class InstallPackageModel
+    {
+        [DataMember(Name = "kitGuid")]
+        public Guid KitGuid { get; set; }
+        [DataMember(Name = "manifestId")]
+        public int ManifestId { get; set; }
+        [DataMember(Name = "packageFile")]
+        public string PackageFile { get; set; }
+
+    }
+}