Use named parameters for more legible code

Close #40

src/FieldEntry.php

@@ -32,9 +32,9 @@ final class FieldEntry {
      * @param string        $explica             Explanation.
      */
     public function __construct(
-        bool $required, array $allowedValues,
-        array $dependsOn, string $remark,
-        string $name_human_readable, string $explica
+        bool $required = false, array $allowedValues = [],
+        array $dependsOn = [], string $remark = "",
+        string $name_human_readable = "", string $explica = ""
     ) {
         $this->required = $required;
         $this->allowedValues = $allowedValues;