Update projects for Preview 5 (dotnet#1541)

* Update projects for Preview 5

* Add test to embedd a pdb and also do a better job of building on preview 4 and below dev 15 previews.

* alternate version detection

* Embed test failed on success .... fix it

* clean up from prior failures for embedded test

* don't modify output name for embedded testcase

FSharp.Editor.fsproj

@@ -69,10 +69,11 @@
     <Reference Include="Microsoft.VisualStudio.Text.Logic" />
     <Reference Include="Microsoft.VisualStudio.CoreUtility" />
     <Reference Include="Microsoft.VisualStudio.OLE.Interop.dll" />
-    <Reference Include="Microsoft.VisualStudio.Shell.Immutable.10.0.dll" />
+    <Reference Include="Microsoft.VisualStudio.Shell.Immutable.10.0.dll" Condition="!Exists('$(VS150COMNTOOLS)..\IDE\PublicAssemblies\Microsoft.VisualStudio.Shell.Framework.dll')" />
     <Reference Include="Microsoft.VisualStudio.Shell.Immutable.11.0.dll" />
     <Reference Include="Microsoft.VisualStudio.ProjectAggregator" />
     <Reference Include="Microsoft.VisualStudio.Shell.Design, Version=$(VisualStudioVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
+    <Reference Include="Microsoft.VisualStudio.Shell.Framework, Version=$(VisualStudioVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="Microsoft.VisualStudio.Utilities, Version=$(VisualStudioVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="Microsoft.VisualStudio.Threading, Version=$(VisualStudioVersion).0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
     <Reference Include="Microsoft.VisualStudio.Shell.Interop.dll" />