Rename Formatter to FormatterHelper in the code style layer

Visual Basic does not support extern alias directives, so we cannot
disambiguate the references.

src/CodeStyle/CSharp/CodeFixes/Microsoft.CodeAnalysis.CSharp.CodeStyle.Fixes.csproj

@@ -38,7 +38,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(MicrosoftCodeAnalysisCSharpWorkspacesFixedVersion)" />
   </ItemGroup>
   <ItemGroup Label="Project References">
-    <ProjectReference Include="..\..\Core\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" Aliases="global,CodeStyle" />
+    <ProjectReference Include="..\..\Core\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" />
     <ProjectReference Include="..\..\Core\CodeFixes\Microsoft.CodeAnalysis.CodeStyle.Fixes.csproj" />
     <ProjectReference Include="..\Analyzers\Microsoft.CodeAnalysis.CSharp.CodeStyle.csproj" />
   </ItemGroup>

src/CodeStyle/Core/Analyzers/Formatting/Formatter.cs → src/CodeStyle/Core/Analyzers/Formatting/FormatterHelper.cs

@@ -16,7 +16,7 @@ namespace Microsoft.CodeAnalysis.Formatting
     /// <summary>
     /// Formats whitespace in documents or syntax trees.
     /// </summary>
-    internal static class Formatter
+    internal static class FormatterHelper
     {
         /// <summary>
         /// Gets the formatting rules that would be applied if left unspecified.

src/CodeStyle/Core/Analyzers/FormattingAnalyzerHelper.cs

@@ -7,6 +7,7 @@
 using Microsoft.CodeAnalysis.Text;
 
 #if CODE_STYLE
+using Formatter = Microsoft.CodeAnalysis.Formatting.FormatterHelper;
 using FormatterState = Microsoft.CodeAnalysis.Formatting.ISyntaxFormattingService;
 using OptionSet = Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions;
 #else

src/CodeStyle/Core/CodeFixes/FormattingCodeFixHelper.cs

@@ -2,16 +2,12 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if CODE_STYLE
-extern alias CodeStyle;
-#endif
-
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Text;
 
 #if CODE_STYLE
-using Formatter = CodeStyle::Microsoft.CodeAnalysis.Formatting.Formatter;
+using Formatter = Microsoft.CodeAnalysis.Formatting.FormatterHelper;
 using FormatterState = Microsoft.CodeAnalysis.Formatting.ISyntaxFormattingService;
 using OptionSet = Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions;
 #else

src/CodeStyle/Core/CodeFixes/FormattingCodeFixProvider.cs

@@ -12,12 +12,11 @@
 
 #if CODE_STYLE
 using OptionSet = Microsoft.CodeAnalysis.Diagnostics.AnalyzerConfigOptions;
+using Formatter = Microsoft.CodeAnalysis.Formatting.FormatterHelper;
 #endif
 
 namespace Microsoft.CodeAnalysis.CodeStyle
 {
-    extern alias CodeStyle;
-    using Formatter = CodeStyle::Microsoft.CodeAnalysis.Formatting.Formatter;
     using ISyntaxFormattingService = ISyntaxFormattingService;
 
     internal abstract class AbstractFormattingCodeFixProvider : CodeFixProvider

src/CodeStyle/Core/CodeFixes/Microsoft.CodeAnalysis.CodeStyle.Fixes.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.Common" Version="$(MicrosoftCodeAnalysisWorkspacesCommonFixedVersion)" />
   </ItemGroup>
   <ItemGroup Label="Project References">
-    <ProjectReference Include="..\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" Aliases="global,CodeStyle" />
+    <ProjectReference Include="..\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" />
   </ItemGroup>
   <ItemGroup>
     <InternalsVisibleTo Include="Microsoft.CodeAnalysis.CSharp.CodeStyle.Fixes" />

src/CodeStyle/VisualBasic/CodeFixes/Microsoft.CodeAnalysis.VisualBasic.CodeStyle.Fixes.vbproj

@@ -37,7 +37,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.VisualBasic.Workspaces" Version="$(MicrosoftCodeAnalysisVisualBasicWorkspacesFixedVersion)" />
   </ItemGroup>
   <ItemGroup Label="Project References">
-    <ProjectReference Include="..\..\Core\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" Aliases="global,CodeStyle" />
+    <ProjectReference Include="..\..\Core\Analyzers\Microsoft.CodeAnalysis.CodeStyle.csproj" />
     <ProjectReference Include="..\..\Core\CodeFixes\Microsoft.CodeAnalysis.CodeStyle.Fixes.csproj" />
     <ProjectReference Include="..\Analyzers\Microsoft.CodeAnalysis.VisualBasic.CodeStyle.vbproj" />
   </ItemGroup>