Let's not use hardcoded service IDs

Author: shana

src/GitHub.Exports/Services/IMenuProvider.cs

@@ -8,7 +8,7 @@ namespace GitHub.VisualStudio
     /// Container for static and dynamic visibility menus (context, toolbar, top, etc)
     /// Get a reference to this via MEF and register the menus
     /// </summary>
-    [Guid("76904E1A-9D58-41AB-8957-C23B9F50727B")]
+    [Guid(Guids.MenuProviderId)]
     public interface IMenuProvider
     {
         /// <summary>

src/GitHub.Exports/Services/IUIProvider.cs

@@ -2,12 +2,12 @@
 using System.ComponentModel.Composition.Hosting;
 using GitHub.Models;
 using GitHub.UI;
-using System.Windows.Controls;
 using System.Runtime.InteropServices;
+using GitHub.VisualStudio;
 
 namespace GitHub.Services
 {
-    [Guid("76909E1A-9D58-41AB-8957-C26B9550787B")]
+    [Guid(Guids.GitHubServiceProviderId)]
     public interface IUIProvider : IServiceProvider
     {
         ExportProvider ExportProvider { get; }

src/GitHub.Exports/Settings/Guids.cs

@@ -8,5 +8,9 @@ public static class Guids
         public const string ImagesId = "27841f47-070a-46d6-90be-a5cbbfc724ac";
         public const string MenuProviderId = "36FA083F-E0BE-418E-B42F-CB7623C55A00";
         public const string UsageTrackerId = "9362DD38-7E49-4B5D-9DE1-E843D4155716";
+        public const string GitHubServiceProviderId = "76909E1A-9D58-41AB-8957-C26B9550787B";
+
+        // VisualStudio IDs
+        public const string GitSccProviderId = "11B8E6D7-C08B-4385-B321-321078CDD1F8";
     }
 }

src/GitHub.TeamFoundation.14/Base/TeamExplorerServiceHolder.cs

@@ -48,7 +48,7 @@ public IServiceProvider ServiceProvider
                 serviceProvider = value;
                 if (serviceProvider == null)
                     return;
-                GitUIContext = GitUIContext ?? UIContext.FromUIContextGuid(new Guid("11B8E6D7-C08B-4385-B321-321078CDD1F8"));
+                GitUIContext = GitUIContext ?? UIContext.FromUIContextGuid(new Guid(Guids.GitSccProviderId));
                 UIContextChanged(GitUIContext?.IsActive ?? false, false);
             }
         }
@@ -118,7 +118,7 @@ public void ClearServiceProvider(IServiceProvider provider)
 
         public void Refresh()
         {
-            GitUIContext = GitUIContext ?? UIContext.FromUIContextGuid(new Guid("11B8E6D7-C08B-4385-B321-321078CDD1F8"));
+            GitUIContext = GitUIContext ?? UIContext.FromUIContextGuid(new Guid(Guids.GitSccProviderId));
             UIContextChanged(GitUIContext?.IsActive ?? false, true);
         }
 

src/GitHub.VisualStudio/GitHubPackage.cs

@@ -23,7 +23,7 @@ namespace GitHub.VisualStudio
     [Guid(GuidList.guidGitHubPkgString)]
     [ProvideMenuResource("Menus.ctmenu", 1)]
     // this is the Git service GUID, so we load whenever it loads
-    [ProvideAutoLoad("11B8E6D7-C08B-4385-B321-321078CDD1F8")]
+    [ProvideAutoLoad(Guids.GitSccProviderId)]
     [ProvideToolWindow(typeof(GitHubPane), Orientation = ToolWindowOrientation.Right, Style = VsDockStyle.Tabbed, Window = EnvDTE.Constants.vsWindowKindSolutionExplorer)]
     [ProvideOptionPage(typeof(OptionsPage), "GitHub for Visual Studio", "General", 0, 0, supportsAutomation: true)]
     public class GitHubPackage : AsyncPackage