Features & bugfixes

- Feature: added new getFirstHeader to Request object that will return the first header found from array list- used to simplify the code.
- Feature: added new InputHandler::getValueFromArray method that loops through input-items to ensure that value is always returned.
- Fixed calling getUrl with array as parameters option throws error.
- Fixed `SimpleRouter::getUrl` having wrong nullable return type.

src/Pecee/Http/Url.php

@@ -371,7 +371,7 @@ class Url implements \JsonSerializable
      */
     public function getParam(string $name, ?string $defaultValue = null): ?string
     {
-        return isset($this->getParams()[$name]) ?? $defaultValue;
+        return (isset($this->getParams()[$name]) === true) ? $this->getParams()[$name] : $defaultValue;
     }
 
     /**