466 8.4 compat (#468)

* tweak: fix deprecation for parent calls

* tweak: fix use of processing instruction node

* ci: all versions

* tweak: attempt 8.4/8.5 compatibility

* tweak: attempt 8.4/8.5 compatibility

* tweak: attempt 8.4/8.5 compatibility

* ci: debug

* ci: debug

* ci: debug

* ci: debug

* ci: use actual encoding of processing instruction

* test: remove non-existent test

* test: disable phpcs complexity on htmldocument

* tweak: null-safe check

Create SECURITY.md

Static analysis compatibility with PHP 8.1 and PHP 8.4

* tweak: php 8.1 support

* tweak: php 8.4 support

* tweak: inherit integers from parent node class

* tweak: inherit integers from parent node class

* tweak: class definition

* tweak: fix node extension issue

* tweak: php 8.4 changes

* tweak: phpcs ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

* tweak: phpstan ignore node files

Upgrade dependencies (#452)

* tweak: allow select disabled property

* build: upgrade dependencies

* build: backwards compatibility

Map DOMDocument::class to Gt\Dom\HTMLDocument::class (#449)

* Map DOMDocument::class to Gt\Dom\HTMLDocument::class

Fixes `DOMDocument::registerNodeClass(): Argument #2 ($extendedClass) must not be an abstract class` from change in PHP 8.1.26

* Map DOMDocument::class to static::class

Ensures DOMDocument is always mapped to the class that extends abstract Gt\Dom\Document

build: loosen psr/http-message (#443)

build: use v2 psr http message (#440)

dataset camel case bugfix (#434)

* test: isolate bug #432

* fix: correct camel case for dataset attributes
closes #432

PHP 8.2 compatibility (#412)

Escaped characters (#394)

* bug: certain elements do not encode properly on render
closes #356

* test: test bug #356 provided by @kartofelek007

* test: extra assertions - check escaped string are not in the render

* test: Remove unnecessary echo

* scratch: Marcin's test isolation

* fix: more work towards #356

* tweak: remove scratch file

* fix: better solution to #356 using processing entity