Addin: Retarget to .Net 4.0

The addin will now work on VS2010 without installing .Net 4.5.

ILSpy.AddIn/ILSpy.AddIn.csproj

@@ -4,6 +4,7 @@
     <!-- Use the SDK for the current version of Visual Studio -->
     <VsSdkTargets Condition="'$(VisualStudioVersion)'!=''">$(MSBuildExtensionsPath)\Microsoft\VisualStudio\v$(VisualStudioVersion)\VSSDK\Microsoft.VsSDK.targets</VsSdkTargets>
     <VsSdkTargets Condition="'$(VisualStudioVersion)'==''">$(MSBuildExtensionsPath)\Microsoft\VisualStudio\v10.0\VSSDK\Microsoft.VsSDK.targets</VsSdkTargets>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition="'$(VisualStudioVersion)' != ''">
     <!-- This is added to prevent forced migrations in Visual Studio 2012 and newer -->
@@ -22,7 +23,7 @@
     <AssemblyName>ILSpy.AddIn</AssemblyName>
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>Key.snk</AssemblyOriginatorKeyFile>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup>
     <!-- Common debugging support -->

ILSpy.AddIn/Resources.Designer.cs

@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.35317
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.

ILSpy.AddIn/source.extension.vsixmanifest

@@ -10,7 +10,7 @@
     <!--TODO: <PreviewImage>~200px image</PreviewImage>-->
     <MoreInfoUrl>http://ilspy.net</MoreInfoUrl>
     <Locale>1033</Locale>
-    <SupportedFrameworkRuntimeEdition MinVersion="4.5" MaxVersion="6.0"/>
+    <SupportedFrameworkRuntimeEdition MinVersion="4.0" MaxVersion="6.0"/>
     <SupportedProducts>
       <VisualStudio Version="10.0">
         <Edition>Pro</Edition>