Config: give `phpcs.xml` priority over `.phpcs.xml.dist`
Config: give `phpcs.xml` priority over `.phpcs.xml.dist`

As per https://github.com/squizlabs/PHP_CodeSniffer/issues/1566#issuecomment-335034128

jrfnl/PHP_CodeSniffer,arnested/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,arnested/PHP_CodeSniffer,VANINUitgeverij/PHP_CodeSniffer,VANINUitgeverij/PHP_CodeSniffer,fabacino/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,arnested/PHP_CodeSniffer,squizlabs/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,VANINUitgeverij/PHP_CodeSniffer,fabacino/PHP_CodeSniffer,jrfnl/PHP_CodeSniffer,fabacino/PHP_CodeSniffer,stronk7/PHP_CodeSniffer,stronk7/PHP_CodeSniffer