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

extend/phinx/Db/Action/Action.php

@@ -0,0 +1,38 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace Phinx\Db\Action;
+
+use Phinx\Db\Table\Table;
+
+abstract class Action
+{
+    /**
+     * @var \Phinx\Db\Table\Table
+     */
+    protected $table;
+
+    /**
+     * Constructor
+     *
+     * @param \Phinx\Db\Table\Table $table the Table to apply the action to
+     */
+    public function __construct(Table $table)
+    {
+        $this->table = $table;
+    }
+
+    /**
+     * The table this action will be applied to
+     *
+     * @return \Phinx\Db\Table\Table
+     */
+    public function getTable(): Table
+    {
+        return $this->table;
+    }
+}