Use str_starts_with/str_ends_with

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code style: line breaks

code style: static visibility

coding style: control flow line breaks

coding style: control flow whitespaces

coding style: function call spacing

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: class declaration braces

Apply rector renames

Apply remaining rector fixes to lib

Apply rector fixes to config plugin

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add setting to define the samesite cookie policy

As mentioned in
https://github.com/dokuwiki/dokuwiki/pull/3994#pullrequestreview-1473052428
there might be occasions when users might want to change

add setting to define the samesite cookie policy

As mentioned in
https://github.com/dokuwiki/dokuwiki/pull/3994#pullrequestreview-1473052428
there might be occasions when users might want to change the policy to a
stricter one or the somewhat more lenient Lax implementation of current
browsers.

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fix no error message was shown on input errors

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