fix warning when no headline id is provided in section editor

When plugins implement their own section editor, usually no hid parameter
will be set, triggering a warning in PHP 8.

fixes #114

avoid php8 warnings in authad. fixes #3746

fix codestyle

Remove Accept-Encoding from auth_browseruid()

Browsers do not send the same Accept-Encoding header for all requests, so using
it as part of auth_browseruid() can break things. For example, the audi

Remove Accept-Encoding from auth_browseruid()

Browsers do not send the same Accept-Encoding header for all requests, so using
it as part of auth_browseruid() can break things. For example, the audio
CAPTCHA in the official CAPTCHA plugin stopped matching its corresponding
image. Details here:

https://github.com/splitbrain/dokuwiki-plugin-captcha/issues/115#issuecomment-1215007408

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replace deprecated method calls

another go at #3717

c0ece86a0ac0cfab0856b056fb3ce8e726855542 was wrong too, because most
deprecation logs drop the callee

output log messages to STDERR during unit testig

This is especially helpful to notice deprecation messages

Another fix for #3717

The deprecation mechanism did actually log the wrong file (callee
instead of caller). This was fixed and the message adjusted again.

A guardian for very short backtraces and l

Another fix for #3717

The deprecation mechanism did actually log the wrong file (callee
instead of caller). This was fixed and the message adjusted again.

A guardian for very short backtraces and large offsets was added

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log deprecation messages independent from allowdebug

Only the logging configuration should influnece if deprecation messages
are to be logged. By default they should be logged.

better deprecation message for require. fixes #3717

replace deprecated call to dbglog. fixes #3726

use self hosted msglint api. fixes #3736

declare visibility o new method (codestyle fix)

log warnings to error log

This introduces an error handler that will log warnings, including a
stack trace in the error log. This should help plugin and core authors with
identifying cases of uninit

log warnings to error log

This introduces an error handler that will log warnings, including a
stack trace in the error log. This should help plugin and core authors with
identifying cases of uninitilized variables in PHP8+ environments.

A feature flag (default off) will let users temporarily disable the
display of warnings in the frontend. This should allow the usage of not
yet upgraded plugins in many cases. In the future the flag can be
removed again.

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Fix PHP8.1 warnings in logviewer

fixes for the popularity plugin

* initialize values to avoid warnings in PHP 8.1
* avoid iterating over a missing change log

:bug: Fixes #3738 , default value for mediamanger in fullscreen mode

Update Recent.php

Fix bug in line 158:

Change
$itemType = $info['mode'] = $info['media'] ? 'media' : 'page';
to
$itemType = $info['media'] ? 'media' : 'page';

Update Recent.php

Change to use $info['media'] instead of checking for dots in $ID to decide $info['mode'].

Update changelog.php

Change so `$x['media']` is always set to either true or false. This so in Recent.php `$recent['media']` is never null and won't cause undefined array key error in PHP8.

Update PageDiff.php

Update MediaDiff.php

Update PageRevisions.php

Fix history for pages with dot in name

Update MediaRevisions.php

Fix history for pages with dot in name.

Update RevisionInfo.php

Fix broken history for pages with dots in name