Use `std::string_view` to avoid some largely unnecessary copies, and to make string comparisong potentially faster by eliminating repeated `strlen()` calls. Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>