Update some PHP version numbers

Bring Trait constructor in line with Class/interface

Update changelog

PHP 7.1: Support multi-catch

Catch::$type is now an array Catch::$types.

Remove deprecated Comment methods

PHP 7.1: list() with keys

Expr\List will now contain ArrayItems instead of plain variables.
I'm reusing ArrayItem, because code handling list() must also handle
arrays, and this allo

PHP 7.1: list() with keys

Expr\List will now contain ArrayItems instead of plain variables.
I'm reusing ArrayItem, because code handling list() must also handle
arrays, and this allows both to go through the same code path.

This also renames Expr\List->vars to ->items.

TODO: Should Expr\List be dropped in favor of Expr\Array with an
extra flag?

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PHP 7: Short destructuring syntax

Potentially the pretty printer should force use of [] in assignment
context, instead of relying on the existance of the right attribute.

PHP 7: Support nullable types

Using a new NullableType node.

Merge branch '2.x'

Fix computation of expected tokens in parse errors

PHP 7.1: Class constant visibility support

PHP 7.1: Add void+iterable support

In PHP 7 mode, these will now be represented as strings 'void'
and 'iterable'.

Remove support for PHP 5.4

Targeting PHP-Parser 3.0

Improve error recovery quality

In particular, support recovering from a missing trailing semicolon,
while keeping the rest of the expression.

Fix new.test and code test runner

Using only the basename leads to collisions...

Escape all low control characters in strings

Release PHP-Parser 2.1.0

Document that XDebug is super slow

Update CHANGELOG

Avoid superfluous newline when printing Nops

Switch Exit kind attribute to flag

To be consistent with everything else.

Switch to 2.1-dev

Forbid invalid octals in PHP 7 mode

Allow nop statements before namespace declaration