Signal transform documentation. #144

Job	Run time
build (linux-amd64)	1m 43s
build (linux-x86)	1m 36s
build (windows-x64)	3m 35s
build (windows-x86)	2m 59s
runtimes (testscript)	1m 14s
tools	1m 38s
test_e2e	2m 46s
docker_push (simer)	30s
publish (linux-amd64)	9s
docker_push (testscript)	30s
containers (modelc, linux-amd64)	29s
publish (linux-x86)	9s
containers (modelc-x86, linux-x86)	32s
publish (windows-x64)	10s
containers (simbus-sa, linux-amd64)	26s
publish (windows-x86)	5s
	18m 31s

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