[Models] Fixed wrong imported name (#993)

* Fixes 992 (class names in phpdoc where using imported names incorrectly when writing to external file).
Disabled using imported name in external file, except for the models own name.

* Added missing declare strict types

tests/Console/ModelsCommand/GeneratePhpdocWithFqnInExternalFile/Models/Post.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+
+namespace Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\GeneratePhpdocWithFqnInExternalFile\Models;
+
+use Barryvdh\LaravelIdeHelper\Tests\Console\ModelsCommand\GeneratePhpdocWithFqnInExternalFile\Builders\EMaterialQueryBuilder;
+use Illuminate\Database\Eloquent\Model;
+
+class Post extends Model
+{
+    public function newEloquentBuilder($query): EMaterialQueryBuilder
+    {
+        return new EMaterialQueryBuilder($query);
+    }
+}