Css style engine rework #1100

Job	Run time
fmt	26s
build (stable)	26s
test (stable)	1m 18s
build (beta)	30s
clippy (stable)	44s
test (beta)	57s
clippy (beta)	1m 6s
build (nightly)	32s
test (nightly)	55s
clippy (nightly)	43s
build (1.73.0)	34s
test (1.73.0)	1m 25s
clippy (1.73.0)	1m 6s
build (stable minus 1 release)	35s
test (stable minus 1 release)	57s
clippy (stable minus 1 release)	52s
build (stable minus 2 releases)	42s
test (stable minus 2 releases)	1m 11s
clippy (stable minus 2 releases)	53s
	15m 52s

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