add @reset command for AP reset

I'm suggesting to add a @reset command to make reseting large amount of APs easier.

Usage:

@reset a b n

a, b: hp, mp, str, dex, int, luk
n: a positive number

Effect:

The command @reset will decrease ability point a and increase ability point b for n times, and costs n AP resets in your inventory.

Following conditions should be met:
1. You must have enough AP resets.
2. The result must be legal.

Example:

https://forum.maplelegends.com/inde...-at-lvl-195-without-losing-much-damage.35569/

Combined with the @ability command we already have, the above process will be much easier.
(i haven't tried @-mp before, but i guess it will work like others)

Code:

@reset dex int 396
@mp 50
@reset mp dex 49
@reset int dex 396
@reset mp hp 100
@reset mp dex 1