This adds some improvements to improve readability of output lua:

• Parenthesis are omitted if operator precedence allows it
• Expressions list are always printed on 1 line if there is only 1 expression, always printed on multiple lines if there are > 4 expressions, and following old logic otherwise. This solves the following:
  • functions that take only another function don't double indent
  • a(b(c)), [a(b)] is printed on one line
  • Large object literals are printed on multiple lines (instead of one giant line)

Feel free to discuss these changes.