Added getNode function to TreeView to only retrieve part of the hiera… #598

Job	Run time
ios-sfml-graphics	56s
ios-sdl	3m 32s
android-sdl	4m 55s
android-sfml-graphics	2m 35s
linux	5m 30s
linux-latest-dev	4m 59s
linux-oldest	2m 42s
linux-per-backend	4m 51s
macos	4m 54s
windows-clang	5m 21s
windows-oldest	6m 19s
windows-sfml-sdl	2m 24s
windows-static-mt	5m 22s
nightly-build-windows-visual-studio	10m 6s
	1h 4m 26s

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