Promote warnings to error in DOM extension

Closes GH-5418

Consolidate new union type ZPP macro names

They will now follow the canonical order of types. Older macros are
left intact due to maintaining BC.

Closes GH-6112

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument nam

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument name. For now, it is looked up by linear scan and
runtime cached.
* This may leave UNDEF arguments on the stack. To avoid having
to deal with them in other places, a CHECK_UNDEF_ARGS opcode
is used to either replace them with defaults, or error.
* For variadic functions, EX(extra_named_params) are collected
and need to be freed based on ZEND_CALL_HAS_EXTRA_NAMED_PARAMS.

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

Closes GH-5357.

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Remove spurious return true from DOMXPath::registerPhpFunctions()

Only one of three identical cases returned true, and the function
is documented to return void. Remove the outlier.

Use string|array type in DOMXPath::registerPhpFunctions()

Remove no_separation flag

Disallow separation in a number of callbacks

All of these clearly do not need separation support.

Remove proto comments from C files

Closes GH-5758

Fix [-Wundef] warning in DOM extension

Generate method entries for ext/dom

Closes GH-5374

Do not include the same stub multiple times

Closes GH-5322

Remove DOM_GET_THIS macro

This macro is trivial, it's more obvious to use ZEND_THIS directly.

Rename php_dom_create_interator() to php_dom_create_iterator()

Thus fixing an obvious typo.

Use RETURN_THROWS() during ZPP in the date, dba and dom extensions

ext/dom: Replace usages of PHP_FUNCTION and aliases with PHP_METHOD.

Convert ext/dom to use arginfo stub.

zend_parse_parameters_throw() is obsolete

Since `zend_parse_parameters()` throws now, there is no reason to
explicitly call `zend_parse_parameters_throw()` anymore, and since both
ha

zend_parse_parameters_throw() is obsolete

Since `zend_parse_parameters()` throws now, there is no reason to
explicitly call `zend_parse_parameters_throw()` anymore, and since both
have actually the same implementation, we redefine the latter as macro.

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ext/dom: Add global registerNodeNS flag on DOMXPath ctor and property.

Remove mention of PHP major version in Copyright headers

Closes GH-4732.

Add do...while(0) for RETURN_* and ZVAL_* APIs

Closes GH-4255.

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly

Remove local variables

This patch removes the so called local variables defined per
file basis for certain editors to properly show tab width, and
similar settings. These are mainly used by Vim and Emacs editors
yet with recent changes the once working definitions don't work
anymore in Vim without custom plugins or additional configuration.
Neither are these settings synced across the PHP code base.

A simpler and better approach is EditorConfig and fixing code
using some code style fixing tools in the future instead.

This patch also removes the so called modelines for Vim. Modelines
allow Vim editor specifically to set some editor configuration such as
syntax highlighting, indentation style and tab width to be set in the
first line or the last 5 lines per file basis. Since the php test
files have syntax highlighting already set in most editors properly and
EditorConfig takes care of the indentation settings, this patch removes
these as well for the Vim 6.0 and newer versions.

With the removal of local variables for certain editors such as
Emacs and Vim, the footer is also probably not needed anymore when
creating extensions using ext_skel.php script.

Additionally, Vim modelines for setting php syntax and some editor
settings has been removed from some *.phpt files. All these are
mostly not relevant for phpt files neither work properly in the
middle of the file.

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Remove yearly range from copyright notice

Remove year range from copyright notice

Use ZEND_THIS macro to hide implementation details in extensions code.

Replace zend_parse_method_parameters() by zend_parse_parameters() and avoid useless checks.