Add Xceed.Wpf.AvalonDock.dll to VSIX dependencies to launch ILSpy instances correctly

ILSpy.AddIn/ILSpy.AddIn.csproj

@@ -117,8 +117,9 @@
     <AdditionalDependencies Include="$(ILSpyBuildPath)Mono.Cecil.dll" />
     <AdditionalDependencies Include="$(ILSpyBuildPath)Mono.Cecil.Pdb.dll" />
     <AdditionalDependencies Include="$(ILSpyBuildPath)ILSpy.BamlDecompiler.Plugin.dll" />
-	<AdditionalDependencies Include="$(ILSpyBuildPath)Microsoft.DiaSymReader*.dll" />
+	  <AdditionalDependencies Include="$(ILSpyBuildPath)Microsoft.DiaSymReader*.dll" />
   	<AdditionalDependencies Include="$(ILSpyBuildPath)OSVersionHelper.dll" />
+    <AdditionalDependencies Include="$(ILSpyBuildPath)Xceed.Wpf.AvalonDock.dll" />
   </ItemGroup>
 
   <ItemGroup>