Rename refactor doesn't recognise valid F# identifiers

[vsfeedback]

Identifiers like variable names and type names can have a tick ' symbol in them in F# (and OCaml). This is commonly used to denote derivatives and auxiliary definitions.

If you define a type with a name containing a tick then rename refactoring immediately rejects it as an invalid identifier when it isn't.

I think this is a duplicate of a pre-existing bug report that has been fixed for variables but not type names.

This issue has been moved from https://developercommunity.visualstudio.com/content/problem/329247/rename-refactor-doesnt-recognise-valid-f-identifie.html
VSTS ticketId: 677961
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