Let extensions mark classes final, abstract, or readonly - #69
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Fixes #67.
zphp_class_set_flagstakesZPHP_CLASS_FINAL,ZPHP_CLASS_ABSTRACT, orZPHP_CLASS_READONLYand sets the same fields on the class definition that a PHP class declaration sets. The existing checks then apply:newon an abstract extension class throws, a class that extends a final one is a fatal error, and assigning a property of a readonly class throws. Passing final and abstract together returns an error. The function sits at the end of the API table, so extensions built against the previous header still load.The demo extension registers a class of each kind and the extension suite checks them.