make getUserData() fail safely on non-string input

When removing multiple users at once, plugins listening on the
AUTH_USER_CHANGE event may pass the array of user names (params[0]
for 'delete') to

make getUserData() fail safely on non-string input

When removing multiple users at once, plugins listening on the
AUTH_USER_CHANGE event may pass the array of user names (params[0]
for 'delete') to getUserData(), which crashed authplain with an
"Array to string conversion" / illegal offset error.

Guard the bundled auth backends so a non-string user fails safely
by returning false, and document that AUTH_USER_CHANGE params[0] is
a string for create/modify but a string[] for delete.

Fixes #4567

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fix(authad): avoid warning when initAdLdap is called before opts is populated

$this->opts is initialized as an empty array, so the is_array() guard in
initAdLdap() passed even when no domain had bee

fix(authad): avoid warning when initAdLdap is called before opts is populated

$this->opts is initialized as an empty array, so the is_array() guard in
initAdLdap() passed even when no domain had been loaded yet, producing an
"Undefined array key 'domain'" warning on PHP 8 (e.g. from getUserCount()
called by the Popularity admin page).

Fixes #4501

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remove utf8_encode() from authad plugin

updated rector and applied it

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align url for lib/plugin members

ref https://github.com/dokuwiki/dokuwiki/issues/4270

- align url of `plugin.info.txt` to standard prefix
- realign spacing as applicable

return false in getUserData in case of errors

The interface contract for the method getUserData does not allow an empty array to be returned.

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avoid another warning in authad

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adjusted docblocks for renamed class aliases

code style: line breaks

code style: operator spacing

coding style: control flow line breaks

coding style: control flow whitespaces