Add encaps var flags for AST_DIM/AST_VAR for php 8.2 (#227)

For https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Closes #224

In util.php: Don't print a

Add encaps var flags for AST_DIM/AST_VAR for php 8.2 (#227)

For https://wiki.php.net/rfc/deprecate_dollar_brace_string_interpolation

Closes #224

In util.php: Don't print a 0 flag value for combinable flags

For php-ast self-testing, minimize the number of changes in the future
when similar combinable flags get added to existing ast var types.

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Add ast_dump() option AST_DUMP_EXCLUDE_DOC_COMMENT (#192)

Closes #191.

Remove special name and docComment handling in AST dumper

These are normal child nodes since version 50, and 50 is the lowest
supported version.

Use ast\Metadata object for ast\get_metadata()

Use ast\get_metadata() in AST dumper

Param flags are combinable

Add CLOSURE_USE_REF flag

With the CLOSURE_ prefix to distinguish it from the namespace
USE_ flags.

Rename RETURNS_REF to FUNC_RETURNS_REF

Expose FUNC_GENERATOR flag

Fix issue #51

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

Expose PHP 7.1 ARRAY_SYNTAX flags

Add support for "iterable" type

Represent scalar types as AST_TYPE

Per @tpunt's suggestion.

Represent ?? as BINARY_OP

Support PHP 7.1 class constant visibility

a) CLASS_CONST_DECL now uses modifier flags. For PHP < 7.1 we
emuate MODIFIER_PUBLIC here for consistency.
b) CONST_ELEM can now have a d

Support PHP 7.1 class constant visibility

a) CLASS_CONST_DECL now uses modifier flags. For PHP < 7.1 we
emuate MODIFIER_PUBLIC here for consistency.
b) CONST_ELEM can now have a docComment properts (in analog to the
property on PROP_ELEM).

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Add USE_* and MAGIC_* flag constants

This drops the effective dependency on tokenizer.

Also replace token numbers with %d as these are unstable.

Add CLASS_ANONYMOUS flag

Pointed out by @tpunt

Move AST_AND, AST_OR to AST_BINARY_OP as well

Use v20 instead, add to flag list

Use BINARY_ flags for ASSIGN_OP as well

Makes it easier to work with if both use the same flags

Use AST_BINARY_OP instead of AST_GREATER(_EQUAL)

Version 20

Added flag constants for AST_INCLUDE_OR_EVAL

The flags' integral values match the values defined in
Zend/zend_compile.h

Use explicit int-to-string conversion

Add constants for POW, ASSING_POW, SPACESHIP

Update flags for group use declarations

Now the type may also be on GROUP_USE and USE_ELEM