Merge branch '3.x'

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

Fix duplicate switch comment assignment

Fixes #469.

Release PHP-Parser 4.0 Beta 1

Move code gen docs to components and improve

Mention non-fluent helper methods.

Move FAQ into component documentation

Improve constant evaluation and add docs

Split into evaluateDirectly() and evaluateSilently(), to be able
to treat errors more gracefully. Add documentation for constant
evaluation.

Move TokenStream into Internal namespace

Remove Autoloader class

Merge branch '3.x'

Conflicts:
CHANGELOG.md

Release PHP-Parser 3.1.4

Merge branch '3.x'

Handle +(++$x) and -(--$x) as well

Update license year

Merge branch '3.x'

Conflicts:
lib/PhpParser/PrettyPrinter/Standard.php

Fix pretty printing of -(-$x) and +(+$x)

Fixes #459.

FPPP: Fix indentation on list insertion

Use indentation of last list element, instead of indentation
before the insertion point.

Fixes #466.

Bump to PHP 7.2 in documentation

[CS] Order uses A -> Z

[CS] New line in the end of file

[CS] Remove spaces

[CS] Use ::class notation instead of string

Conflicts:
test/PhpParser/ParserFactoryTest.php
test/PhpParser/ParserTest.php

[CS] Space after ternary operator

[CS] Whitespace before return type

[CS] Space before casting

[CS] Trim whitespaces