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fix deprecated phpunit call in styling plugin

Fix tiny typo: missing capital

adjusted docblocks for renamed class aliases

code style: line breaks

code style: operator spacing

code style: ptln removed, useradmin cleanup

coding style: control flow line breaks

coding style: control flow whitespaces

Apply rector renames

Apply rector fixes to the rest of lib/plugin

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eck CSRF token in styling plugin. fixes #3560

much better greek (el) translations

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fix: mark inputs of styling plugin as required

While this cannot ensure that the value is valid, it should prevent
accidental saving of an empty field, which crashes the less compiler.

Fixes #2246

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