Implement PHP CS Fixer and a coding standard to follow (#471)

* Create PHP CS Fixer config and add to CI workflow

* Run php cs fixer on project

* Add newline at end of file

* Update to use PHP CS Fixer v3

* Run v3 config on project

* Run seperate config in CI

database/factories/EstimateItemFactory.php

@@ -46,7 +46,7 @@ class EstimateItemFactory extends Factory
             },
             'discount' => function (array $estimate) {
                 return $estimate['discount_type'] == 'percentage' ? (($estimate['discount_val'] * $estimate['total']) / 100) : $estimate['discount_val'];
-            }
+            },
         ];
     }
 }