帮会特使：派驻盟会的动态抄送

local function dispatchEnvoy(actor, ally)
    setplayvar(actor, "envoyAt", ally)
    setsysvarex("envoyOf_" .. ally,
        getplayvar(actor, "NAME"))
    sendcentermsg(0, getplayvar(actor, "NAME")
        .. " 出任 " .. ally .. " 特使")
end
local function recallEnvoy(actor)
    local at = getplayvar(actor, "envoyAt")
    if at ~= nil then
        setsysvarex("envoyOf_" .. at, "")
        setplayvar(actor, "envoyAt", nil)
    end
end

local function relayNews(ally, news)
    local envoy = getsysvar("envoyOf_" .. ally)
    if envoy ~= nil and envoy ~= "" then
        sendmsg(getplayerbyname(envoy), 1,
            ally .. " 动态：" .. news)
    end
end