Add timestamp and/or PID to warning messages

[eduherminio]

Output of cutechess-cli --version / cutechess --version

cutechess-cli 1.3.1
Using Qt version 5.15.2

How did you run Cute Chess exactly?

&"cutechess-1.3.1-win64\cutechess-cli.exe" `
-engine conf="Lynx-main" `
-engine conf="Lynx 0.15.0" `
-each `
    tc=inf/8+0.08 `
	option.Hash=64 `
-games 2 -rounds 20000 -repeat 2 -maxmoves 400 `
-openings file="books\UHO_XXL_+0.90_+1.19.epd" format=epd `
-sprt elo0=0 elo1=5 alpha=0.05 beta=0.05 `
-concurrency 8 `
-ratinginterval 10 `
-resultformat wide2 `
-pgnout "matches\tasks.pgn"

Expected behavior

Warning messages include a timestamp and with the process PID.

• In order to debug warnings and errors, timestamp is critical to find them in our engines log files
• In case of concurrency > 1, knowing the pid of the process where the issue happened would also help

Something like:

2023-08-14 11:16:23.7202: Warning: Illegal PV move d6c7 from Lynx-main (15754)
Warning: PV:  d6c7

Actual behavior

No timestamp and (n), which I'm not sure what it refers to (since n > concurrency)

Warning: Illegal PV move d6c7 from Lynx-main (12)
Warning: PV:  d6c7