Rename Assistant

[Olivier JG]

Attached are updated patches for the rename assistant. Some questions 
below..
> I don't exactly understand what you mean by this. It is possible to
> tell MovingRange to extend the range on adjacent edits, we could add
> such an option to PersistentMovingRange as well.
I added a bool option to PersistentMovingRange, but perhaps I should 
expose the actual flags?
Perhaps I should just use MovingRange... unless there's another reason 
to use PersistentMovingRange? The rename assistant is gone when the 
document is closed..
> For renaming of local variables, uses() is enough.
Well that's simple enough then. I now don't offer to rename anything 
that opens a context, or is a forward declaration, with an exception for 
functions that aren't class members. Let me know if it should be 
something else.

Pending an answer on MovingRange vs PersistentMovingRange, and if no one 
takes issue with the patches, I'll commit this.

-Olivier JG
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