update phpdoc

deprecate html_form()

encourage plugin devs to use new Form class

remove html_softbreak_callback()

re-declare deprecated function html_edit_form()

call dbg_deprecated(), even this function lost compatibility because its argument $param['form'] has changed to hold Form\Form object

re-declare deprecated function html_li_default()

fix missing return

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `h

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `html_denied()` is not used any plugins, but added fallback just in case.
* `html_locked()` is used by one third-party plugin (AjaxEdit), fallback should be added.
* `html_insert_softbreaks()` is used by one third-party plugin (TOS, terms of service), fallback should be added.

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add dbg_deprecated() calls

tigger HTMLFORM_*_OUTPUT events

trigger events in Form::toHTML() instead of using Event::createAndTrigger()

mark html_denied() and html_locked() as deprecated

and fix coding style

create Ui\Index::buildIndexList()

closure to obsolete html_li_default()

closure to obsolete html_hilight_callback()

mark html_* funcs as deprecated that call relevant Ui class

html_sizechange() returns HTML when $form is not set

print forms without html_form_output()

Update html.php

coding style in html_diff*()

remove '&' form $form argument

$form is object, therefore it is always treated as reference without '&'.

improve html_sizechange() to recognize form class

Ui\Editor class replaces html_edit()

Remove obsolete attributes at <script> tag

Nowadays it is not necessary to specify "type" or "charset" attribute at <script> tag:

1. "type" attribute defaults to "application/javascript", so there

Remove obsolete attributes at <script> tag

Nowadays it is not necessary to specify "type" or "charset" attribute at <script> tag:

1. "type" attribute defaults to "application/javascript", so there is no need to specify that. The recent value "text/javascript" is obsolete in favor of the default "application/javascript", as stated e.g. here: https://www.iana.org/assignments/media-types/media-types.xhtml#text

2. "charset" attribute of the <script> tag defaults to encoding be the same as the encoding of the script element's node document. As DokuWiki's default encoding is "utf-8", there is no need to specify this encoding in external resources. See: https://html.spec.whatwg.org/multipage/scripting.html#the-script-element

Manual merging, closes #2921.

Co-Authored-By: petrkajzar <58340153+petrkajzar@users.noreply.github.com>

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PHP8 fix part 4: Trying to access array offset on value of type bool/null

Merge branch 'htmlvaliditytests'

* htmlvaliditytests:
Ignore certain HTML validity errors
added group internet to html validity checks
fix empty action on login form
fix empty action on rece

Merge branch 'htmlvaliditytests'

* htmlvaliditytests:
Ignore certain HTML validity errors
added group internet to html validity checks
fix empty action on login form
fix empty action on recents form
handle empty changelogs correctly
some basic framework to do at least some HTML validity checking

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