cx/util: toolkit

ls a5168ab295 debug		5 lat temu
..
client.go	539ae32e06 alias httprouter.Router Router	6 lat temu
entrust.go	6e6f0011a6 fork httprouter	6 lat temu
pap.go	a5168ab295 debug	5 lat temu
pay.go	2bc02268be union pay debug	5 lat temu
refund.go	c9f520d429 wechat refund check & random	6 lat temu
server.go	cc6f61da77 init	6 lat temu
wechat.go	988b300464 unionpay	6 lat temu