Declare Directory properties

Some error handling test changes, as changes to the $handle
property are now detected earlier.

Declare tentative return types for ext/standard (#7065)

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Don't accept dir handle in Directory methods

This is an artifact of the shared implementation with readdir() etc.
The method versions should not accept an explicit dir handle, as
the

Don't accept dir handle in Directory methods

This is an artifact of the shared implementation with readdir() etc.
The method versions should not accept an explicit dir handle, as
they work on the dir handle from the object.

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Add support for `@implementation-alias` in stubs

Closes GH-6170

Fix UNKNOWN default values in ext/standard

Closes GH-6026

Generate function entries from stubs for a couple of extensions

Migrates ext/standard, ext/tidy, ext/tokenizer,
ext/xml, ext/xml_reader, and ext/xml_writer. Closes GH-5381.

Do not include the same stub multiple times

Closes GH-5322