⚡ Optimize FEN parsing (#581) #2307

Job	Run time
long-running-tests (ubuntu-latest, LongRunning)	1m 34s
long-running-tests (windows-latest, LongRunning)	2m 19s
long-running-tests (macOS-latest, LongRunning)	1m 45s
make-build (ubuntu-latest)	35s
build-and-publish (ubuntu-latest)	53s
make-build (macos-latest)	49s
build-and-publish (windows-latest)	2m 0s
fast-tests (Debug, ubuntu-latest)	1m 35s
other-tests (ubuntu-latest, Configuration)	46s
build-and-publish (macOS-latest)	1m 3s
fast-tests (Debug, windows-latest)	3m 0s
other-tests (windows-latest, Configuration)	1m 54s
perft-tests (ubuntu-latest, Perft)	3m 6s
fast-tests (Debug, macOS-latest)	1m 40s
other-tests (macOS-latest, Configuration)	52s
perft-tests (windows-latest, Perft)	4m 53s
fast-tests (Release, ubuntu-latest)	1m 11s
winning-at-chess (ubuntu-latest, WinningAtChess_FixedTime)	4m 30s
perft-tests (macOS-latest, Perft)	3m 51s
fast-tests (Release, windows-latest)	2m 24s
fast-tests (Release, macOS-latest)	1m 58s
	42m 38s

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