Move Win16 relay messages to the relay16 channel

[Felix Nawothnig]

Uwe Bonnes wrote:
>>> Why?
>> When you're debugging 16bit programs, sometimes you only want
>> to see 16bit calls.:)
> Isn't your proposal similar to the recent "nrelay" proposal, where only
> calls from native code is logged, but not wine code calling other wine code?

Why exactly do we need this (both nrelay and relay16) when there is 
RelayFromInclude?

Felix