Drop last vestiges of consistent var mode flag

Make useExpressionStatement only supported mode

Add first shot at format preserving pretty printer

Add expression statement mode

Add VarLikeIdentifier

For representing Identifiers that have an implicit leading $.

With this done, maybe go one step further?
* Rename VarLikeIdentifier -> VarIdentifier / Var

Add VarLikeIdentifier

For representing Identifiers that have an implicit leading $.

With this done, maybe go one step further?
* Rename VarLikeIdentifier -> VarIdentifier / VarName
* Use VarIdentifier / VarName also as an inner node in Variable.
Not sure if this adds any real value.

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Use Identifier for property names as well

Represent prop in static prop fetch using Identifier

Add useConsistentVariableNodes mode

The parameter case is a bit weird, because the subnode is called
"name" here, rather than "var". Nothing we can do about that in
this version thou

Add useConsistentVariableNodes mode

The parameter case is a bit weird, because the subnode is called
"name" here, rather than "var". Nothing we can do about that in
this version though.

The two parser options might be merged. I've kept it separate,
because I think this variable representation should become the
default (or even only representation) in the future, while I'm
less sure about the Identifier thing.

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Represent builtin types using Identifier as well

Add useIdentifierNodes mode to parser

In this mode non-namespaced names that are currently represented
using strings will be represented using Identifier nodes instead.
Identifier no

Add useIdentifierNodes mode to parser

In this mode non-namespaced names that are currently represented
using strings will be represented using Identifier nodes instead.
Identifier nodes have a string $name subnode and coerce to string.

This allows preserving attributes and in particular location
information on identifiers.

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Add support for negative interpolated offsets

A late addition to PHP 7.1 which I missed.

Parse 0 in "$a[0]" as LNumber (#325)

Wrap List_ in ArrayItem

This was correctly done for the 'key'=>list() form, but not for
unkeyed nested lists.

Support recovery from Foo::

Support recovery from free-standing $

Support recovery for new without class name

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the assoc

Graceful handling for "special" errors

Nearly all special errors are now handled gracefully, i.e. the
parser will be able to continue after encountering them. In some
cases the associated error range has been improved using the new
end attribute stack.

To achieve this the error handling code has been moved out of the
node constructors and into special methods in the parser.

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Correctly assign attrs for encaps vars

Fix GroupUse prefix attribute assignment

Retain comments on blocks on first inner statement

Forbid "=& new" in PHP 7 mode

Decrement errorState when recovering from -> error

It's likely that an error after -> will trigger another one due to
missing semicolon without shifting a single token. We prevent an

Decrement errorState when recovering from -> error

It's likely that an error after -> will trigger another one due to
missing semicolon without shifting a single token. We prevent an
immediate failure in this case by manually setting errorState to 2,
which will suppress the duplicate error message, but allow error
recovery.

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Support partial parsing of $foo->

Introduce Error node for this purpose.

Introduce explicit Finally node

Bring Trait constructor in line with Class/interface