Change the display name of the roslyn analyzers to "Roslyn Analyzers" to avoid...

Change the display name of the roslyn analyzers to "Roslyn Analyzers" to avoid conflicting with the "Roslyn Diagnostics" window.

Bonus: move the project into the folder hierarchy.

CR: srivatsn; kevinpi (changeset 1388791)

Src/Diagnostics/Roslyn/Setup/source.extension.vsixmanifest

@@ -3,7 +3,7 @@
 <PackageManifest Version="2.0.0" xmlns="http://schemas.microsoft.com/developer/vsx-schema/2011" xmlns:d="http://schemas.microsoft.com/developer/vsx-schema-design/2011">
   <Metadata>
     <Identity Id="b3d2dbbd-311e-47ee-b4ff-679c4505b3de" Version="|%CurrentProject%;GetBuildVersion|" Language="en-US" Publisher="Microsoft" />
-    <DisplayName>Roslyn Diagnostics</DisplayName>
+    <DisplayName>Roslyn Analyzers</DisplayName>
     <Description xml:space="preserve">Diagnostics for the Roslyn codebase.</Description>
   </Metadata>
   <Installation>