clang-format VS plugin: upgrade the project files to VS2015

The plugin itself runs on previous VS versions, but this enables
it to be built with VS2015.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281648 91177308-0d34-0410-b5e6-96231b3b80d8

tools/clang-format-vs/ClangFormat.sln

 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
+# Visual Studio 14
+VisualStudioVersion = 14.0.25420.1
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ClangFormat", "ClangFormat\ClangFormat.csproj", "{7FD1783E-2D31-4D05-BF23-6EBE1B42B608}"
 EndProject
 Global

tools/clang-format-vs/ClangFormat/ClangFormat.csproj

@@ -14,7 +14,7 @@
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
     <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
-    <MinimumVisualStudioVersion>12.0</MinimumVisualStudioVersion>
+    <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
     <UpgradeBackupLocation>
@@ -219,7 +219,7 @@
   <Import Project="$(VSToolsPath)\VSSDK\Microsoft.VsSDK.targets" Condition="'$(VSToolsPath)' != ''" />
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v10.0\VSSDK\Microsoft.VsSDK.targets" Condition="false" />
   <PropertyGroup>
-    <PreBuildEvent>if not exist $(ProjectDir)Key.snk ("$(FrameworkSDKDir)Bin\NETFX 4.5.1 Tools\sn.exe" -k $(ProjectDir)Key.snk)</PreBuildEvent>
+    <PreBuildEvent>if not exist $(ProjectDir)Key.snk ("$(FrameworkSDKDir)Bin\NETFX 4.6 Tools\sn.exe" -k $(ProjectDir)Key.snk)</PreBuildEvent>
   </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

tools/clang-format-vs/ClangFormat/Resources.Designer.cs

 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.42000
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.