Rft: separate udp/tcp/ws code logic

[wongoo]

there are lot of code that need to consider what kind of the connection, tcp or udp or ws, which let the code logic complex.

So suggest to separate udp/tcp/ws code logic.

For example, a interface can be defined:

type ProtocolHandler interface {
     handleLoop()
     handlePackage()
}

Assign matched ProtocolHandler to a protocol, not check the type of connection in handler logic, make the logic simple.

[AlexStocks]

A good suggestion. I will do it in some days later.

[AlexStocks]

@wongoo would u try to do it? because i am so familiar with getty that i have no idea how to split them.