RFC: replace relative system/speed scale with user-defined transform callback #2735

Job	Run time
Create test plan	8s
level1 / Haiku	1m 49s
level2 / Steam Linux Runtime (Sniper)	2m 10s
level2 / Nintendo 3DS	2m 2s
level2 / LoongArch64	2m 47s
level2 / FreeBSD	2m 10s
level2 / MacOS (GNU prefix)	1m 48s
level2 / Emscripten	2m 7s
level2 / Sony PlayStation Vita (GLES w/ PVR_PSP2)	2m 7s
level2 / Windows (msys2, mingw32)	18s
level2 / Windows (MSVC, x86)	1m 2s
level2 / GDK (MSVC, x64)	3m 25s
level2 / RISC OS	1m 24s
level2 / Sony PlayStation 2	3m 18s
level2 / Windows (MSVC, clang-cl x64)	55s
level2 / MacOS (Framework) (arm64)	1m 27s
level2 / NetBSD	2m 45s
level2 / MacOS (Framework) (x64)	2m 6s
level2 / PowerPC64	1m 55s
level2 / Windows (MSVC, ARM64)	1m 8s
level2 / Windows (msys2, ucrt64)	1s
level2 / Windows (MSVC, clang-cl x86)	1m 14s
level2 / Android (Gradle)	2m 16s
level2 / tvOS (CMake & xcode)	1m 0s
level2 / Windows (msys2, clang64)	28s
level2 / Ubuntu 20.04	1m 36s
level2 / PowerPC	1m 49s
level2 / Windows (MSVC, ARM)	1m 12s
level2 / iOS (CMake & xcode)	52s
level2 / Sony PlayStation Portable	3m 18s
level2 / Sony PlayStation Vita (GLES w/ pib)	3m 17s
level2 / Android (CMake, lean)	1m 5s
level2 / Ubuntu 20.04 (Intel oneAPI)	1m 52s
level2 / Android (Android.mk)	1m 18s
level2 / Windows (msys2, clang32)	26s
level2 / Ubuntu 20.04 (Intel Compiler)	2m 6s
level2 / Android (CMake)	1m 9s
level2 / Windows (msys2, mingw64)	23s
level2 / Windows (MSVC, x64)	1m 7s
level2 / Ubuntu 22.04	1m 35s
	1h 4m 55s

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