换个名字 , client_impl . 防止名字冲突.
rework with new avboost::async_coro_queue API
IRC 重写, 逻辑更清晰~!!!
prepare for 重启不重登录
m_clientid 尽量保持唯一! 不要每次都变!
style
clean_cache 协程清理重写
prepare for persistent storage of group info
初始化数据库
avoid "database schama has changed"

reconnect before excute or reconnect on throw "database schama has changed"
revert avoid "database schama has changed"

use shared cache!
group list info insert into database
move buddy mgr to seperated lib
刷新群qq号~
as the buddy_mgr progress, more operation move to coroutine
groups and buddies now all stored in sqlite database.

the groups and buddies info all stored in database.
makding buddies member readonly
fix qqnum 无抓取 bug
fix a bug cause silent igonre!
fix  null value fetched but no indicator!