Also unhug listcomps / dictcomps / setcomps

Fix extra comma in tuples which contain a fix in their first element

Fix parsing of zero-length tokens

Add trailing commas on function defs if --py36-plus is passed

Special case handling tuples

Handle multiple functions in the same starting position

Remove automatic py35+ syntax detection

Resolve commas in one stage for multi-line string nodes

Don't unhug things containing only a triple-quoted-string

Don't introduce trailing whitespace on blank lines when unhugging

Simplify functions now that we are handling unhug of (

Change back to single pass now that it is top-down

Handle parenthesized things and more proper reindenting

Better handle escaped newlines

Fix cases for more than one argument