skill:
fire selm Mana cost down from 360 to 320
cause critical Mana cost down from 320 to 280
warp lightning Mana cost down from 340 to 320
cure serious Mana cost down from 170 to 140
heal Mana cost down from 250 to 240
group heal Mana cost down from 380 to 340
pet Mana cost down from 400 to 350
fire storm Mana cost down from 380 to 340
lightning storm Mana cost down from 380 to 340
System:
新增 系统讯息 频道，用于各种讯息公布或者游戏提示，
若不想看到的玩家可以透过 channel bc 指令来开/关闭 (建议开启)
修正一些玩家提供的bug，尚未领到奖励的请尽快跟我讲