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/Plan/NewTable.php

@@ -0,0 +1,101 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace Phinx\Db\Plan;
+
+use Phinx\Db\Table\Column;
+use Phinx\Db\Table\Index;
+use Phinx\Db\Table\Table;
+
+/**
+ * Represents the collection of actions for creating a new table
+ */
+class NewTable
+{
+    /**
+     * The table to create
+     *
+     * @var \Phinx\Db\Table\Table
+     */
+    protected $table;
+
+    /**
+     * The list of columns to add
+     *
+     * @var \Phinx\Db\Table\Column[]
+     */
+    protected $columns = [];
+
+    /**
+     * The list of indexes to create
+     *
+     * @var \Phinx\Db\Table\Index[]
+     */
+    protected $indexes = [];
+
+    /**
+     * Constructor
+     *
+     * @param \Phinx\Db\Table\Table $table The table to create
+     */
+    public function __construct(Table $table)
+    {
+        $this->table = $table;
+    }
+
+    /**
+     * Adds a column to the collection
+     *
+     * @param \Phinx\Db\Table\Column $column The column description
+     * @return void
+     */
+    public function addColumn(Column $column): void
+    {
+        $this->columns[] = $column;
+    }
+
+    /**
+     * Adds an index to the collection
+     *
+     * @param \Phinx\Db\Table\Index $index The index description
+     * @return void
+     */
+    public function addIndex(Index $index): void
+    {
+        $this->indexes[] = $index;
+    }
+
+    /**
+     * Returns the table object associated to this collection
+     *
+     * @return \Phinx\Db\Table\Table
+     */
+    public function getTable(): Table
+    {
+        return $this->table;
+    }
+
+    /**
+     * Returns the columns collection
+     *
+     * @return \Phinx\Db\Table\Column[]
+     */
+    public function getColumns(): array
+    {
+        return $this->columns;
+    }
+
+    /**
+     * Returns the indexes collection
+     *
+     * @return \Phinx\Db\Table\Index[]
+     */
+    public function getIndexes(): array
+    {
+        return $this->indexes;
+    }
+}