Allow multiline list literals

Not sure if this is by design or not, but this fails with "Error: Except ']' to close list.":

https://gist.github.com/untothebreach/c16a9899ddccef420aff

Also, attempting to escape the newlines with a backslash gives "Error: Unknown character ''."

Ok, after digging a bit, it seems that the newlines after the commas are getting ignored correctly, but the newline after the [ and the newline after the last element in the list (3 in the gist) are not being ignored. In fact, this does work:

do
    val mlist = [ 1,
                  2,
                  3]
    print(mlist) // expect [1, 2, 3]
end