Place Nop nodes more precisely

If the Nop is created to collect comments, place it directly after
the comment, instead of at the next non-whitespace character.

Add support for union types

We definitely need to introduce a general "Type" abstraction in
the next major version.

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
be

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
because the end attributes will be the at the last non-whitespace,
non-comment token, which might be quite far back. More problematically,
we may not have encountered any non-discarded token if we're at the
start of the file, in which case we will have no end attributes to
assign.

Change things to use a canonical "zero-length" node representation,
where the end position (token & file) will be exactly one before the
start position.

Fixes #589.

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add float/double/real KIND support to Cast\Double node

Flexible doc strings: Fix some issues, add more tests

Flexible doc: Validate and strip indentation

If indentation is invalid, we strip on a best-effort basis.

The error position information is not great, but I don't want to
introdu

Flexible doc: Validate and strip indentation

If indentation is invalid, we strip on a best-effort basis.

The error position information is not great, but I don't want to
introduce sub-token error positioning at this point in time.

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Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get compl

Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get complicated now.

For now only implement the validation of the indentation on the
end label.

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Remove unused ParserAbstract::$errors property

Leftover from before ErrorHandler was introduced.

Rename YYNLSTATES to numNonLeafStates

Clear parser state directly after parsing

I don't think this makes any difference in practical scenarios, but
it makes memory usage analysis simpler.

Fix PHP5 static call fixup

Variable nodes directly store the variable name as a string, they
don't use VarLikeIdentifier. So remove this wrapper if it exists.

Ensure nodes have full complement of location info

Handle Nop statement after brace-style namespace

Fixes #412.

Add strict_types to lib code

Add isSpecialClassName() method to Identifier and Name

Add toLowerString() method to Name and Identifier

Avoids patterns like strtolower((string) $name) when using
strict types.

[cs] use strict comparison where allowed

[cs] use PHP 5.4 short array, since PHP 7.0 is min version

Add support for object type

Generate PHP 7 type annotations

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node constructors still accepts strings and will implicitly create
an Identifier wrapper. Identifier implement __toString(), so that
outside of strict-mode many things continue to work without changes.

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Fix some typing issues

Adjust the end attributes on the stack as well

Make Expr\Error nodes empty

Resolves issue #359.

Improve doc comments