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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Split off private data from the ns mapper

Add LIBXML_NO_XXE constant (#14844)

This constant is available as of libxml2 2.13, and is used together with
LIBXML_NOENT to allow entity subsitution but disallow external entities.

Implement Dom $innerHTML property

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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Sync #if/ifdef/defined (#14508)

This syncs CPP macro conditions:
- _WIN32
- _WIN64
- HAVE_ALLOCA_H
- HAVE_ALPHASORT
- HAVE_ARPA_INET_H
- HAVE_CONFIG_H
- HAVE_DIRE

Sync #if/ifdef/defined (#14508)

This syncs CPP macro conditions:
- _WIN32
- _WIN64
- HAVE_ALLOCA_H
- HAVE_ALPHASORT
- HAVE_ARPA_INET_H
- HAVE_CONFIG_H
- HAVE_DIRENT_H
- HAVE_DLFCN_H
- HAVE_GETTIMEOFDAY
- HAVE_LIBDL
- HAVE_POLL_H
- HAVE_PWD_H
- HAVE_SCANDIR
- HAVE_SYS_FILE_H
- HAVE_SYS_PARAM_H
- HAVE_SYS_SOCKET_H
- HAVE_SYS_TIME_H
- HAVE_SYS_TYPES_H
- HAVE_SYS_WAIT_H
- HAVE_UNISTD_H
- PHP_WIN32
- ZEND_WIN32

These are either undefined or defined to 1 in Autotools and Windows.

Follow up of GH-5526 (-Wundef).

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Move more common code into php_dom_next_in_tree_order() (#14363)

Add support for LIBXML_NOXMLDECL for modern documents (#14209)

This wasn't supported before, but should be.

Optimize and reduce memory usage of XML serialization (#14204)

The serialization process uses the system allocator and requires a copy
to request allocated memory once finished. This pat

Optimize and reduce memory usage of XML serialization (#14204)

The serialization process uses the system allocator and requires a copy
to request allocated memory once finished. This patch improves this by
using smart_str to build the resulting string, reducing the number of
copies and reducing total peak memory usage.

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Handle dumping node to file

Handle dumping document to file

Factor out all common code for XML serialization and merge common paths

Fix unused argument warning

Update ext/dom names after policy change (#14171)

Use true instead of 1 with php_dom_throw_error

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

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

Add LIBXML_RECOVER (#13504)

Setting the recovery option by using a hardcoded value (1) worked
already for SimpleXML. For DOM, a small change is necessary because
otherwise the recove

Add LIBXML_RECOVER (#13504)

Setting the recovery option by using a hardcoded value (1) worked
already for SimpleXML. For DOM, a small change is necessary because
otherwise the recover field overwrites the recovery option.

From a quick search on GitHub [1] it looks like this won't clash with
existing PHP code as no one seems to define (or use) a constant with
such a name.

[1] https://github.com/search?q=LIBXML_RECOVER+language%3APHP&type=code&l=PHP

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