Highlight all references

Hi Mike,

Unfortunately we don't have any functionality to that extent built in.  Finding references would probably require more of a compiler sort of functionality, which is beyond the scope of the add-on.  That being said, you certainly could try and use Roslyn to try and find references to a symbol.

We don't have a highlight related keywords option either.  For that you could do some token (although beware of doing that synchronously in very large documents to avoid freezing UI) or AST scanning.  Remember the parse data for a document that possibly has AST info in it comes back asynchronously after edits, and any offsets in the AST would need to be translated from the parse data's snapshot over to the document's current snapshot.