Tweaked custom command registration, Added StyleCI fixes

Old command registration method was interfering with default commands,
causing only a limited subset of commands to show overall.
This change follows the method the frameworks uses when loading in from a
directory to prevent issues with run/load order.

app/Entities/Models/Entity.php

@@ -211,6 +211,7 @@ abstract class Entity extends Model implements Sluggable, Favouritable, Viewable
     /**
      * Check if this instance or class is a certain type of entity.
      * Examples of $type are 'page', 'book', 'chapter'.
+     *
      * @deprecated Use instanceof instead.
      */
     public static function isA(string $type): bool