Add save and load for PnP export #1601

Job	Run time
stylecheck	25s
build-debug	14m 8s
build-opensuse (all)	14m 47s
build-arch (all)	14m 35s
build-opensuse (horizon.so)	6m 12s
build (ubuntu:focal, g++, gcc, all)	14m 22s
build-arch (horizon.so)	4m 25s
build-pr-review	3m 19s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 28s
build (ubuntu:jammy, g++, gcc, all)	11m 48s
build (ubuntu:jammy, g++, gcc, horizon.so)	3m 53s
build (ubuntu:noble, g++, gcc, all)	12m 13s
build (ubuntu:noble, g++, gcc, horizon.so)	4m 14s
build (debian:bullseye, g++, gcc, all)	11m 53s
build (debian:bullseye, g++, gcc, horizon.so)	4m 8s
build (debian:bookworm, clang, clang, all)	13m 52s
build (debian:bookworm, clang, clang, horizon.so)	4m 20s
build (debian:bookworm, g++, gcc, all)	14m 15s
build (debian:bookworm, g++, gcc, horizon.so)	4m 28s
	2h 41m 45s

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