Switch save game to json #657

Job	Run time
Build (ubuntu:noble, gcc, LEGACY, OFF, true)	11m 58s
Build (ubuntu:noble, clang, LEGACY, OFF, true)	12m 22s
Build (ubuntu:noble, gcc, GLVND, OFF, true)	11m 38s
Build (ubuntu:noble, clang, GLVND, OFF, true)	12m 42s
Build (ubuntu:jammy, gcc, GLVND, OFF, false)	10m 6s
Build (ubuntu:jammy, clang, GLVND, OFF, false)	11m 51s
Build (ubuntu:focal, gcc, GLVND, OFF, false)	11m 39s
Build (ubuntu:focal, clang, GLVND, OFF, false)	11m 4s
Build (linuxmintd/mint22-amd64, clang, GLVND, OFF, true)	12m 39s
Build (linuxmintd/mint21.3-amd64, clang, GLVND, OFF, true)	12m 23s
Build (linuxmintd/mint21.2-amd64, clang, GLVND, OFF, true)	12m 28s
Build (linuxmintd/mint21.1-amd64, clang, GLVND, OFF, true)	12m 22s
Build (linuxmintd/mint21-amd64, clang, GLVND, OFF, false)	12m 28s
Build (linuxmintd/mint20-amd64, clang, GLVND, OFF, false)	11m 16s
Build (debian:bookworm, clang, GLVND, OFF, false)	12m 22s
Build (debian:bullseye, clang, GLVND, OFF, false)	12m 25s
Build (opensuse/leap:15.6, clang, LEGACY, ON, true)	11m 27s
Build (opensuse/leap:15.6, clang, GLVND, ON, true)	11m 43s
Build (opensuse/leap:15.5, clang, LEGACY, ON, true)	11m 0s
Build (opensuse/leap:15.5, clang, GLVND, ON, true)	11m 23s
Build (opensuse/leap:15.4, clang, GLVND, ON, false)	11m 49s
Build (fedora:39, clang, LEGACY, ON, true)	12m 0s
Build (fedora:39, clang, GLVND, ON, true)	11m 50s
Build (fedora:40, clang, LEGACY, ON, true)	11m 54s
Build (fedora:40, clang, GLVND, ON, false)	11m 32s
Build (rockylinux_rockylinux:9.4, clang, GLVND, ON, false)	12m 16s
	5h 8m 37s

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