campaign\town\buildings\stage_coach的stage_coach.building 是普通难度和高难
modes\radiant\campaign\town\buildings\stage_coach 简单难度
"first_hero_classes" : (第一次的两个英雄)
"number_of_recruits_upgrades": (每次的提供英雄数量)
"roster_size_upgrades" : (英雄名单数量)
"upgraded_recruits_upgrades" : (英雄等级概率与自带技能)