Fixes (#435)

* Add flight level field to PIREP field closes #401

* Default value for distance 0 closes #400

* Block airline deletion if assets exist #367

* Formatting

* Move some of the base exception classes

* Fix skin references to use settings table

* Set default for theme name if setting is wrong

app/Exceptions/Converters/SymfonyException.php

@@ -2,10 +2,10 @@
 
 namespace App\Exceptions\Converters;
 
-use App\Exceptions\HttpException;
+use App\Exceptions\AbstractHttpException;
 use Symfony\Component\HttpKernel\Exception\HttpException as SymfonyHttpException;
 
-class SymfonyException extends HttpException
+class SymfonyException extends AbstractHttpException
 {
     private $exception;