[Cuis-dev] [ChangeSet] source ranges for cascade parse nodes

[Nahuel Garbezza]

Hi!

Attached are two changesets to add support for source range tracking of
cascade nodes. This is particularly useful for refactorings like the
extract method or the extract temporary variable.

Example: if you have this expression:

3 factorial; yourself

now we are not reporting source range for the cascade, just for each
individual message. From now on, we'll be able to get:

* "raw" source range: 3 [factorial; yourself] (original source range
definition, used for debugging)
* "complete" source range: [3 factorial; yourself] (definition added for
refactoring purposes)

The reason I made two changesets is because I wanted to extract a method in
the Parser but I cannot do it in the same changeset, because it could break
the image.

* The first changeset includes the new feature itself
* The second changeset is just cleanup to make the parser #cascade method
more readable.

This change allows us to automatically support a new extract method case,
which is extracting expressions enclosing cascade message sends (yay!).
Also attached a test for it.

Thanks,
Nahuel
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