Applied some rector rules to update the code; Some formatting and sorting, too. (!4) · Merge requests · project / entity_translate_side_by_side · GitLab

ConsistentImplodeRector (http://php.net/manual/en/function.implode.php#refsect1-function.implode-description)
ClosureToArrowFunctionRector (https://wiki.php.net/rfc/arrow_functions_v2)
ClassPropertyAssignToConstructorPromotionRector (https://wiki.php.net/rfc/constructor_promotion https://github.com/php/php-src/pull/5291)
ChangeSwitchToMatchRector (https://wiki.php.net/rfc/match_expression_v2)

Closes #3418308