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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Support doc comments for php 8.1 code, combine equivalent switch cases (#204)

* Support parsing php 8.1 enum doc comments

Requires https://github.com/php/php-src/pull/6984
(php

Support doc comments for php 8.1 code, combine equivalent switch cases (#204)

* Support parsing php 8.1 enum doc comments

Requires https://github.com/php/php-src/pull/6984
(php 8.1 has no public alphas yet)

* Combine equivalent case statements in generated code

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Support php 8.1 enums (#197)

* Support php 8.1 enums

* Test with travis and php 8.0, again

* AST_ENUM_CASE can have attributes

* Set `type` property of `AST_CLASS`

Support php 8.1 enums (#197)

* Support php 8.1 enums

* Test with travis and php 8.0, again

* AST_ENUM_CASE can have attributes

* Set `type` property of `AST_CLASS` iff ast version 85+

(iff === if and only if)

* Add AST_CLASS's type in version 85+ prior to php 8.1

* [skip ci] Document support for php 8.1 enums

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