Fix GH-15570: Segmentation fault (access null pointer) in ext/dom/html5_serializer.c

Closes GH-15572.

Fix NULL pointer dereference with NULL content in legacy nodes (#15546)

Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM

Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM document fragment. Interacting with the DOM tree cannot touch
the elements in the document fragment.

Closes GH-14906.

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Revert "Remove unnecessary include statements from dom"

This reverts commit dd795022fa5644cc8a5a54fd63c99ab3c6bc81e1.

Remove unnecessary include statements from dom

Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Preferably include from build dir (#13516)

* Include from build dir first

This fixes out of tree builds by ensuring that configure artifacts are included
from the build dir.

Before, out of tree builds would preferably include files from the src dir, as
the include path was defined as follows (ignoring includes from ext/ and sapi/) :

-I$(top_builddir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/main
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM
-I$(top_builddir)/

As a result, an out of tree build would include configure artifacts such as
`main/php_config.h` from the src dir.

After this change, the include path is defined as follows:

-I$(top_builddir)/main
-I$(top_builddir)
-I$(top_srcdir)/main
-I$(top_srcdir)
-I$(top_builddir)/TSRM
-I$(top_builddir)/Zend
-I$(top_srcdir)/Zend
-I$(top_srcdir)/TSRM

* Fix extension include path for out of tree builds

* Include config.h with the brackets form

`#include "config.h"` searches in the directory containing the including-file
before any other include path. This can include the wrong config.h when building
out of tree and a config.h exists in the source tree.

Using `#include <config.h>` uses exclusively the include path, and gives
priority to the build dir.

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Fix serialization of entity references in attributes (#13884)

[RFC] Add a way to opt-in ext/dom spec compliance (#13031)

RFC: https://wiki.php.net/rfc/opt_in_dom_spec_compliance

Use strcspn() to optimize dom_html5_escape_string() (#12948)

* Use strcspn() to optimize dom_html5_escape_string()

This routine implemented by libc uses a faster algorithm than the

Use strcspn() to optimize dom_html5_escape_string() (#12948)

* Use strcspn() to optimize dom_html5_escape_string()

This routine implemented by libc uses a faster algorithm than the old
naive byte-per-byte approach here. It also is often optimized using
SIMD.

* Calculate mask outside of loop

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[RFC] DOM HTML5 parsing and serialization support (#12111)