Add tuple literals#136
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Added support for tuple literals in expressions, and improved error messages if incorrectly written tuples are encountered. This raised some complexity as previously the parser handled arguments to a function with a bespoke local scanner; implementing tuple literals meant dealing with these actually being a series of expressions properly.
Fixed a bug when reading multiline-literals in expressions.
Removed the (frankly poorly named) ParsingError::InvalidLiteral (which was actually just about unit literals) as a new ParsingError::InvalidTuple overlaps and subsumes the original case.