Massive rewrite how loss normalisation works #1790

Job	Run time
test-integration-bumpver	12s
test-integration-citation-cff	51s
test-integration-ormolu	21s
build-vehicle-python / vehicle-python / Linux - x86_64	16m 38s
build-vehicle / vehicle / Linux - GHC 9.4.8	14m 1s
build-vehicle-python / vehicle-python / Linux - x86_64	15m 44s
build-vehicle / vehicle / macOS - GHC 9.4.8	15m 14s
build-vehicle-python / vehicle-python / macOS - x86_64	41m 5s
build-vehicle / vehicle / Windows - GHC 9.4.8	15m 52s
build-vehicle-python / vehicle-python / Windows - AMD64	20m 38s
build-vehicle / vehicle / Linux - GHC 9.8.1	15m 58s
build-vehicle / vehicle / Linux - GHC 9.6.4	14m 7s
build-vehicle / vehicle / Linux - GHC 9.2.8	14m 4s
build-vehicle / vehicle / Linux - GHC 9.0.2	15m 5s
build-vehicle / vehicle / Linux - GHC 8.10.7	14m 38s
build-vehicle / vehicle / Linux - GHC 9.4.8 -fnothunks	14m 10s
Publish package to PyPI	0s
Publish package to GitHub Releases	0s
	3h 48m 38s

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