修复seeder错误；删除第三方的think迁移工具，在extend中重新实现；

extend/think/migration/command/stubs/factory.stub

@@ -0,0 +1,11 @@
+<?php
+
+use Faker\Generator as Faker;
+use think\migration\Factory;
+
+/** @var Factory $factory */
+$factory->define("ModelClass", function (Faker $faker) {
+    return [
+        //
+    ];
+});