======package_setting(背包设置)======

=====配置说明=====

-   **initial_size**=50; //背包初始容量//

-   **expand_size**=10; //每次扩容格数//

-   **expand_cost1**=100; //第1次扩容价格//

-   **expand_cost2**=200; //第2次扩容价格//

-   **expand_cost3**=400; //第3次扩容价格//

-   **expand_cost4**=800; //第4次扩容价格//

-   **expand_cost5**=1600; //第5次扩容价格//