Remove unimplemented DOM classes

[beberlei]

There are a bunch of classes that are not documented in php.net docs and have never been implemented. They even contain test data in their properties. Example:

$ php -r 'var_dump(new DOMNameList());'
object(DOMNameList)#1 (1) {
  ["length"]=>
  string(4) "TEST"
 }

In the extension to the DOM standard (PHP implements level 1, 2, 3 to some extend) called DOM living standard these classes have been removed as well: https://dom.spec.whatwg.org/#dom-core-changes

The affected (and therefore removed) classes are:

• DOMConfiguration
• DOMDomError
• DOMErrorHandler
• DOMImplementationList
• DOMImplementationSource
• DOMLocator
• DOMNameList
• DOMTypeInfo
• DOMUserDataHandler

While this looks like a backwards compatibility break, nobody will use these classes in production, because they have no behavior, and also were never "reachable" or returned from the actively used DOM classes as part of a return value or a public property.

[KalleZ]

I don't see any problem doing this for master. Any non operational userland code shouldn't be exposed by internals at the very least.

[beberlei]

Merged in 25bfac4