feat!: quiqqer v2

BREAKING CHANGE: quiqqer v2 has been renamed to quiqqer/core. a new major version will be created here so that we can still develop for both versions.

ajax/frontend/redeem.php

@@ -26,7 +26,7 @@ function ($code, $orderHash) {
             QUI::getMessagesHandler()->addError($Exception->getMessage());
 
             return false;
-        } catch (\Exception $Exception) {
+        } catch (Exception $Exception) {
             QUI\System\Log::writeException($Exception);
 
             QUI::getMessagesHandler()->addError(
@@ -95,7 +95,7 @@ function ($code, $orderHash) {
 
         $coupons[] = $code;
 
-        $coupons = \array_unique($coupons);
+        $coupons = array_unique($coupons);
 
         $Order->setData('quiqqer-coupons', $coupons);
         $Order->update();