[FEATURE] Add dedicated property accessors for OutputFormat (#871)

Author: oliverklee

config/phpstan-baseline.neon

@@ -1,8 +1,3 @@
 parameters:
-	ignoreErrors:
-		-
-			message: '#^Call to an undefined method Sabberworm\\CSS\\OutputFormat\:\:setIndentation\(\)\.$#'
-			identifier: method.notFound
-			count: 2
-			path: ../src/OutputFormat.php
+	ignoreErrors: []