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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Disable Xdebug - travis does not support php 8.0 (#193)

If tests don't work with Xdebug, that's an issue with Xdebug.
(in php 8.1.0-dev, it's broken, which is normal due to rapid changes)

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

This reverts commit b0370e632aad7b2c6feadaa8ea4610e5e0c055c6.

Revert "[skip ci] fix .travis.yml"

This reverts commit 7e039f90fc7de67c7985d3141631885e5d601a77.

[skip ci] fix .travis.yml

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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Document new flags for AST_TYPE (null/false)

Try building against PHP 7.4

Add PHP 7.3 to Travis CI

Start testing with php 7.2 in travis (nightly is 7.3-dev)

Add 7.1 to travis

nightly will diverge at some point...

Fix PHP 7.0 build

Build on Travis