Update arrays and tuples

[savq]

Arrays:

• Add _immediate_bracket rule to scanner
• Rename array_expression to vector_expression
• Rename array_comprehension_expression to comprehension_expression
• Allow newlines in matrices
• Allow newlines in comprehensions
• Allow multiple semicolon terminators. This allows n-dimensional concatenation inside arrays (outside arrays multiple semicolons are ignored).
• Reuse index_expression for typed arrays. There's no way to distinguish typed vectors from index expressions.
• Add test/corpus/collections.txt file for tuples and arrays' tests.
• Update tests for arrays.

Tuples:

• Add named_tuple_expression rule separate from tuple_expression
• Add parenthesize function to simplify the repeated pattern: seq('(', rules, ')')
• Allow tuples in _do_parameter_list
• Allow tuples in optional_parameter
• Allow tuples in typed_parameter

---

• closes #27
• closes #37
• closes #48
• closes #80
• closes #81

[savq]

Right now this PR has a small regression.

An expression like:

[2:x-1, 1]

Will be parsed as

(matrix_expression
  (matrix_row (range_expression (integer_literal) (identifier)
  (matrix_row (unary_expression (operator) (identifier))
  (ERROR)
  ...)

Basically, it parses 2:x and -1 as separate expressions so it thinks this is a matrix, not a vector.

I have no idea on how to handle the space-sensitive mode of the femtolisp parser.