Add `flower-field`, deprecating `minesweeper` #457

Job	Run time
Generate a list of last OTP versions	7s
Test examples against OTP 24.3	2m 40s
Test examples against OTP 22.3	2m 49s
Test examples against OTP 23.3	2m 56s
Test examples against OTP 25.3	2m 55s
Test examples against OTP 26.2	2m 36s
Test examples against OTP 28.0	2m 28s
Test examples against OTP 27.3	2m 17s
	18m 48s

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