Support constants in patterns (fixes #696) #998

Job	Run time
docs	1m 57s
rustfmt	7s
clippy	1m 37s
runefmt	1m 58s
basics	1s
msrv	1m 52s
miri_rune_alloc	5m 48s
miri_rune	7m 22s
build_feature (capture-io)	1m 7s
no_default_features	57s
build_feature (cli,doc)	1m 20s
no_std_minimal	3m 9s
wasm	1m 6s
build_feature (cli,fmt)	1m 29s
build_feature (cli)	1m 42s
build_feature (workspace)	52s
build_feature (languageserver)	1m 16s
build_feature (byte-code)	1m 22s
test	10m 50s
	45m 52s

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