[Insight] Unused use statement should be avoided (BrickController.php#L11)

closes #105
[Insight] Unused use statement should be avoided (DefaultController.php#L7)

closes #106
[Insight] Unused method, property, variable or parameter (BrickController.php#L54)

closes #107
[Insight] Unused method, property, variable or parameter (BrickExtension.php#L13)

closes #108
[Insight] Unused use statement should be avoided (BrickController.php#L10)

closes #104