Arrow operator chain indentation

[ofbeaton]

Right now code like:

$myclass
  ->add()
  ->filter('haha')
  ->clone();

doesn't work. It wants to put it all on a single line, which is not very readable for operators like this. Will need to verify if PSR-2 speaks to this, and if not, then figure out how to fix it up.

Right now phpcbf is putting up into a single line but it doesn't do it properly, leaving too much spacing between $myclass and the first ->.

Consider upstream implications, we may be able to get this done elsewhere.