Layout with ratio can now also be created with RelativeValue object a… #748

Job	Run time
android-sdl	6m 11s
ios-sdl	3m 53s
android-sfml-graphics	2m 48s
ios-sfml-graphics	49s
linux	5m 8s
linux-latest-dev	4m 32s
linux-oldest	3m 16s
linux-per-backend	5m 34s
macos	1m 47s
windows	2m 20s
windows-clang	5m 27s
windows-oldest	5m 59s
windows-static-mt	4m 59s
nightly-build-windows-visual-studio	8m 11s
	1h 0m 54s

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