Refactor some model stuff out into traits

src/Core/Support/VisibleScope.php

@@ -0,0 +1,19 @@
+<?php namespace Flarum\Core\Support;
+
+use Flarum\Events\ScopeModelVisibility;
+use Illuminate\Database\Eloquent\Builder;
+use Flarum\Core\Users\User;
+
+trait VisibleScope
+{
+    /**
+     * Scope a query to only include records that are visible to a user.
+     *
+     * @param Builder $query
+     * @param User $actor
+     */
+    public function scopeWhereVisibleTo(Builder $query, User $actor)
+    {
+        event(new ScopeModelVisibility($this, $query, $actor));
+    }
+}