API: legacy compatibility fix

wiki.getAllPages and dokuwiki.getPagelist differed in how the last
modification timestamp was communicated.

This should fix splitbrain/dokuwiki-plugin-sync#70

Reintroduce the FEED_DATA_PROCESS event

As explained here:
https://github.com/dokuwiki/dokuwiki/issues/4191

fix logo aspect ratio and printing. fixes #4187

fix overeager optimization in Table handler. fixes #4186

This reverts an optimization introduced in
bcaec9f47d06126b3e653fea89a86d8b6a6cbef8

The number of elements in $this->tableCalls may change d

fix overeager optimization in Table handler. fixes #4186

This reverts an optimization introduced in
bcaec9f47d06126b3e653fea89a86d8b6a6cbef8

The number of elements in $this->tableCalls may change during the loop,
so they need to be recounted on every step. To protect it from being
"optimized" again, the loop was changed into a while loop.

Ultimately it should be checked if this method could be optimized in
another way.

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adjust group type hint for User API response

fix User response object in API

�� Rector and PHPCS fixes

Fix false errors when calling getInfo() from some plugins

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inc/fulltext Result from splice could be empty

The code for `AND` and `OR` assumes the call to splice will always
return 2 elements, which isn't the case if no terms are found.

Example log messages

inc/fulltext Result from splice could be empty

The code for `AND` and `OR` assumes the call to splice will always
return 2 elements, which isn't the case if no terms are found.

Example log messages:

PHP Warning: Undefined array key 0 in .../dokuwiki/inc/fulltext.php on line 134
PHP Warning: Undefined array key 1 in .../dokuwiki/inc/fulltext.php on line 134
PHP Warning: foreach() argument must be of type array|object, null given in .../dokuwiki/inc/fulltext.php on line 614

Simplified example, via `php -a`:

php > $arr = [];
php > [$a, $b] = array_splice($arr, -2);
PHP Warning: Undefined array key 0 in php shell code on line 1
PHP Warning: Undefined array key 1 in php shell code on line 1

To clear the warning we check if the result is empty and break early,
otherwise we pass the result into `ft_resultCombine` or
`ft_resultUnite`, which both handle the length 1 arrays.

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�� Rector and PHPCS fixes

�� Update deleted files

replace LESS library. fixes #4088

This replaces the abandoned fork with my own fork at splitbrain/lesserphp

That fork has been cleaned up somewhat and the issues in #4088 should be
fixed.

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�� Rector and PHPCS fixes

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show update message in Extension Manager if available

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remove obsolete feed creation code

This was left over in #4156

io_deleteFromFile: pass a string not null

�� Rector and PHPCS fixes

Updated composer dependencies