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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php-ast 1.1.0dev: Deprecate AST versions 50 and 60, drop support for php < 7.2 (#185)

* Deprecate AST versions 50 and 60

AST version 70 has been supported since php-ast 1.0.1 (2019-

php-ast 1.1.0dev: Deprecate AST versions 50 and 60, drop support for php < 7.2 (#185)

* Deprecate AST versions 50 and 60

AST version 70 has been supported since php-ast 1.0.1 (2019-02-11).

Related to #114

* Drop support for php <= 7.1

Update documentation to mention this.

* Update test expectation for AST version 60 deprecation

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Fix PHP 7.4 build

AST_ASSIGN_OP now directly stores the binary op, assign op opcodes
no longer exist.

Deprecate AST version 40

Remove version 15

Deprecate version 20, mark 35 as default

Deprecate version 15

Switching tests to version 30 where possible.

Deprecate version 10

Use version 30 for named children

Use string child names for non-list nodes

Implementation needs some polishing.

Use BINARY_ flags for ASSIGN_OP as well

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