Add a unique id to declarations in version 45+

For issue #58

The output of `var_dump(ast\parse_code('<?php function(){};function(){};', 45));`

will include '__declId' value

Add a unique id to declarations in version 45+

For issue #58

The output of `var_dump(ast\parse_code('<?php function(){};function(){};', 45));`

will include '__declId' values starting from 0.
The counter will reset if `parse_code` is called again,

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Deprecate version 30

Create package.xml for the php-ast project

Verified that `pecl package; pecl install ast-0.1.5dev.tgz` worked in
php 7.1.

For Issue #29 (Having a package.xml reduces the work to

Create package.xml for the php-ast project

Verified that `pecl package; pecl install ast-0.1.5dev.tgz` worked in
php 7.1.

For Issue #29 (Having a package.xml reduces the work to submit this to PECL)

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Add constructors with parameters for Node (#55)

Signature: new Node(kind, flags, children, lineno)

Assume that the constructor is either never used with parameters
or used very

Add constructors with parameters for Node (#55)

Signature: new Node(kind, flags, children, lineno)

Assume that the constructor is either never used with parameters
or used very frequently (e.g. ast simplifier, code refactoring,
php-parser to ast conversion, etc.)
Validate the data types of params, but not the values themselves.

For backwards compatibility reasons, leave parameters
with no passed values as null, and make everything nullable.
- Assume no pre-existing code would pass in values.

This constructor hasn't been benchmarked yet
(compare with assigning params manually).
php-parser-to-php-ast (incomplete) is one codebase that could be used to
test this, e.g. in a loop.

Also, add aliases to simplify setting a Node property to a zend_long.
- AST_CACHE_SLOT_FLAGS was missing in one place, this PR added it back.
Was the absense deliberate?
- TRY_DELREF is unnecessary in some places, and wrong for parameters to
the constructor.

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Fix rendered HTML link to php-ast-reverter (#57)

Fix issue #51

Make attribute value for virtual nodes explicit, fix the nullable
case.

Fix ast_dump_with_linenos.phpt test

Back to dev

Release version 0.1.4

With fix for handling of nullable types

Mark 40 as current version

Drop support for version 20

Fix handling of ?array and ?callable

Wrap these in AST_NULLABLE_TYPE as well.

Add 7.1 to travis

nightly will diverge at some point...

Back to dev

Release version 0.1.3

Update current version in README

Update display of extension in phpinfo() (#39)

Fix typo in flag list (#37)

Fix PHP 7 build

Update USE_* flags for PHP 7.2

These now use ZEND_SYMBOL_*.

Fix issue #36

The emulation of PHP 7.0 list() structure did not account for
skipped elements.

Mark AST_GREATER(_EQUAL) as obsolete

Drop EXPERIMENTAL file

Followup of ac993fd

Remove "experimental" note

Update stubs