Backports and cleanups #931

Job	Run time
rustfmt	9s
clippy	2m 1s
docs	1m 51s
runefmt	1m 44s
basics	1s
msrv	2m 3s
miri_rune	5m 49s
build_feature (capture-io)	53s
miri_rune_alloc	4m 28s
build_feature (cli,doc)	1m 31s
no_default_features	58s
no_std_minimal	3m 40s
build_feature (cli,fmt)	1m 26s
wasm	1m 0s
build_feature (cli)	1m 25s
build_feature (workspace)	56s
build_feature (languageserver)	1m 14s
build_feature (byte-code)	46s
test	11m 9s
	43m 4s

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