FPPP: Support insertion into list subnodes

With some rough edges...

FPPP: Switch pArray() to use node list diffing

Add implementation of Myers differ

Intended to be used in the format-preserving pretty printer for
handling changes in node lists.

Make code more explicit

Add Identifier::toString()

For symmetry with the Name API.

Also add some missing unit tests.

Tweaks

Add name resolution, pretty printing component docs

The docs are receiving too little love...

FPPP: Fall back if comment in list node changes (#420)

Merge branch '3.x'

Conflicts:
lib/PhpParser/Parser/Php5.php
lib/PhpParser/Parser/Php7.php

Preserve comments on empty blocks (#382)

Add constant expression evaluator (#402)

Remove PHP 5 substr() workaround

In PHP 7 it no longer returns false instead of '' in this case.

Update changelog

Add get{Start,End}{Line,TokenPos,FilePos}() methods

Don't return by ref from getAttribute()

This is not worth the few times where it might be useful.

Add Node::getComments() method

Add back commented test

We're not testing HHVM anymore, and I've already fixed this bug
upstream.

Merge branch '3.x'

Conflicts:
lib/PhpParser/Parser/Php5.php
lib/PhpParser/Parser/Php7.php
test/PhpParser/ParserTest.php

Add attribute for namespace kinds (#417)

One of KIND_SEMICOLON or KIND_BRACED.

Remove leftover property intialization in pretty printer (#416)

Don't continue of searching if a global namespace declaration is found

Fix InlineHTML indentation

Extract TokenStream class from pretty printer

Replace noIndent mechanism in pretty printer

Instead store newline with indentation in $nl property and use it
where needed.

The implementation should be changed to compilet ind

Replace noIndent mechanism in pretty printer

Instead store newline with indentation in $nl property and use it
where needed.

The implementation should be changed to compilet indentLevel and
fpIndentLevel, I don't think these need to be kept separate.

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Remove workarounds for reserved keyword method names

No longer necessary in PHP 7.