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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Regenerate AST stub

Remove ASSIGN_* flags

As well as old flag versioning information.

Remove unused AST kinds

Remove ast\Node\Decl

No longer used since version 50, which is the lowest supported one.

Regenerate stub file

Fix misspelling

Add ast\get_supported_versions() function

Closes #77.

Update stub file

Regenerate stubs

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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Update stubs

Tweak stubs file

Add script to generate stubs

Move both gen scripts into common scripts/ folder.

add ast_stub.php

to provide phpdoc stub for use with IDEs