this gives an ability for host (vs) to talk to remote host (service hub)

added MustRunInProc in IBuiltInAnalyzer and some clean up around serializing Solution/Project/DocumentId and how DocumentState is exposed.

Switch to using TaggedText (from SymbolDisplayPart) for features that want to display classified text.

This is done by reflection.

.. code actions for a refactoring.

.. after merge..

We didn't offer move type to new file if there was a single outer type
in a document with a nested type in it. Move to new file should be
offered for the nested type here.

.. checks identifier checks for rename type.

.. an abstract class. Then, MoveType, RenameFile, RenameType edits are
performed by different subclasses of the editor.