Add a constant field order for separate saving of WorldModel.xml #123

Job	Run time
lint / build	1m 29s
build-rockylinux-distro-release-tests / build	46m 40s
build-macos-release-tests / build	29m 20s
build-ubuntu-release-tests / build	29m 50s
build-macos-debug-tests / build	41m 51s
build-altlinux-release-tests / build	30m 8s
build-rockylinux-installer-release-tests / build	59m 12s
build-ubuntu-debug-tests / build	57m 51s
build-macos-installer / build	13m 1s
install-macos-installer / job	12m 55s
build-rockylinux-installer / build	24m 52s
install-rockylinux-installer / job	10m 59s
install-astralinux18-installer / job	10m 28s
install-altlinux-installer / job	10m 44s
install-ubuntu-installer / job	10m 14s
install-archlinux-installer / job	10m 25s
	6h 39m 59s

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