Moved media files and introduced IImageDimensionExtractor and to avoid System.drawing in core

src/Umbraco.Core/Install/InstallSteps/StarterKitInstallStep.cs

@@ -0,0 +1,66 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Umbraco.Core.Security;
+using Umbraco.Core.Services;
+using Umbraco.Net;
+using Umbraco.Web.Install.Models;
+
+namespace Umbraco.Web.Install.InstallSteps
+{
+    [InstallSetupStep(InstallationType.NewInstall,
+        "StarterKitInstall", 31, "",
+        PerformsAppRestart = true)]
+    internal class StarterKitInstallStep : InstallSetupStep<object>
+    {
+        private readonly IUmbracoApplicationLifetime _umbracoApplicationLifetime;
+        private readonly IBackOfficeSecurityAccessor _backofficeSecurityAccessor;
+        private readonly IPackagingService _packagingService;
+
+        public StarterKitInstallStep(IUmbracoApplicationLifetime umbracoApplicationLifetime, IBackOfficeSecurityAccessor backofficeSecurityAccessor, IPackagingService packagingService)
+        {
+            _umbracoApplicationLifetime = umbracoApplicationLifetime;
+            _backofficeSecurityAccessor = backofficeSecurityAccessor;
+            _packagingService = packagingService;
+        }
+
+
+        public override Task<InstallSetupResult> ExecuteAsync(object model)
+        {
+            var installSteps = InstallStatusTracker.GetStatus().ToArray();
+            var previousStep = installSteps.Single(x => x.Name == "StarterKitDownload");
+            var packageId = Convert.ToInt32(previousStep.AdditionalData["packageId"]);
+
+            InstallBusinessLogic(packageId);
+
+            _umbracoApplicationLifetime.Restart();
+
+
+
+            return Task.FromResult<InstallSetupResult>(null);
+        }
+
+        private void InstallBusinessLogic(int packageId)
+        {
+            var definition = _packagingService.GetInstalledPackageById(packageId);
+            if (definition == null) throw new InvalidOperationException("Not package definition found with id " + packageId);
+
+            var packageFile = new FileInfo(definition.PackagePath);
+
+            _packagingService.InstallCompiledPackageData(definition, packageFile, _backofficeSecurityAccessor.BackOfficeSecurity.GetUserId().ResultOr(-1));
+        }
+
+        public override bool RequiresExecution(object model)
+        {
+            var installSteps = InstallStatusTracker.GetStatus().ToArray();
+            //this step relies on the previous one completed - because it has stored some information we need
+            if (installSteps.Any(x => x.Name == "StarterKitDownload" && x.AdditionalData.ContainsKey("packageId")) == false)
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}