Support php 8.0 "Constructor Promotion" and attributes (#160)

- attributes are only available in AST version 80+,
and will be null before php 8.0

Revert "Support php 8.0 "Constructor Promotion" and attributes"

This reverts commit b0370e632aad7b2c6feadaa8ea4610e5e0c055c6.

Support php 8.0 "Constructor Promotion" and attributes

Because AST_CLASS_CONST_DECL is a list of nodes, don't add the key
"attributes" to the hash table in older AST versions.

A

Support php 8.0 "Constructor Promotion" and attributes

Because AST_CLASS_CONST_DECL is a list of nodes, don't add the key
"attributes" to the hash table in older AST versions.

Add visibility modifiers to AST_PARAM, but only in php 8.0+.
MODIFIER_PUBLIC and PARAM_REF are the same value in php 7.4.

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Add AST_CLASS_NAME in AST version 70 (#111)

Add AST_CLASS_NAME in AST version 70

Fixes #109

Tests pass with a local PHP 7.4 installation

Add AST_PROP_GROUP in version 70.

The type information is deliberately left out of versions < 70.

`children['type']` is a Node describing the type of the property group,
or null

Add AST_PROP_GROUP in version 70.

The type information is deliberately left out of versions < 70.

`children['type']` is a Node describing the type of the property group,
or null.
`children['props']` is the AST_PROP_DECL.

The property visibility modifier flags were moved to the AST_PROP_GROUP.

Update package.xml

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Use ast\Metadata object for ast\get_metadata()

Don't use Decl nodes in version 50

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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Support nullable types

Represent these using a new AST_NULLABLE_TYPE virtual node.

Rename some child names

Change some node names

Use AST_VAR node for static var + catch var

For version 20. Previously this was a simple string with the
variable name.

Use string child names for non-list nodes

Implementation needs some polishing.