RFC: New log_destination 'fifo'

Hello,

So it is possible to do this in other ways but I thought it might be 
interesting to allow people to define fifo or pipe as a log_desination. 
This would allow a person to tail the fifo to receive the outputs of the 
log as it happens but would not take up precious IO or space from the 
disk. I personally have found this valuable when diagnosing immediate 
unexpected problems. It would also work on Windows.

Sincerely,

JD


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