introduce default YAxisMinMaxMode #468

Job	Run time
build-macos-brew (clang-9)	3m 0s
build-macos-brew-Qt6 (clang-9)	3m 20s
build-linux-Qt6 (gcc-9)	7m 54s
build-linux (gcc-9)	7m 8s
build-macos-no-brew (clang-9)	4m 36s
build-macos-no-brew-Qt6 (clang-9)	5m 39s
build-windows-mingw (5.15.*)	9m 48s
build-windows-mingw-Qt6 (6.3.0, qtmultimedia qt5compat)	11m 18s
build-windows-vs (5.15.*)	8m 33s
build-windows-vs-Qt6 (6.3.0, qtmultimedia qt5compat)	13m 10s
	1h 14m 26s

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