code style: line breaks

code style: operator spacing

coding style: control flow whitespaces

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Form

Prevent double escaping of form labels

\dokuwiki\Form\Form::addLabelHTML() should not escape label content (again)

Support the multiple attribute in Form selects

This should fix a problem mentioned in
https://github.com/splitbrain/dokuwiki-plugin-data/pull/229#issuecomment-1196367602

Note that prefilling from $

Support the multiple attribute in Form selects

This should fix a problem mentioned in
https://github.com/splitbrain/dokuwiki-plugin-data/pull/229#issuecomment-1196367602

Note that prefilling from $INPUT is still only supported for single
value selects.

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Fix undefined array keys when displaying revisions

change event naming scheme

FORM_*_OUTPUT scheme had been introduced since Apriil 2018, see #2286

fix missing or unnecessary use Event statements

Form::toHTML() can trigger event

New event naming scheme HTMLFORM_*_OUTPUT should be tiggered to prevent break of old third-party plugins using old events HTML_*FORM_OUTPUT.

show checkbox and radio before its label text

PSR-12 coding style

Fix curly brace syntax. PHP 7.3 deprecations in inc/ directory.