Fix formatting and interfaces in nearly every file

app/Models/Observers/SubfleetObserver.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models\Observers;
+
+use App\Models\Subfleet;
+
+/**
+ * Class SubfleetObserver
+ * @package App\Models\Observers
+ */
+class SubfleetObserver
+{
+    /**
+     * @param Subfleet $model
+     */
+    public function creating(Subfleet $model)
+    {
+        if (!filled($model->ground_handling_multiplier)) {
+            $model->ground_handling_multiplier = 100;
+        }
+    }
+}