Fuzz

Merge rust-bitcoin/rust-miniscript#676: Use threshold in Terminal and… #39

Job	Run time
fuzz (roundtrip_semantic)	2m 33s
fuzz (parse_descriptor)	2m 33s
fuzz (parse_descriptor_secret)	2m 55s
fuzz (roundtrip_miniscript_script)	2m 46s
fuzz (roundtrip_miniscript_str)	3m 7s
fuzz (roundtrip_descriptor)	3m 10s
fuzz (roundtrip_concrete)	2m 39s
fuzz (compile_descriptor)	2m 56s
verify-execution	0s
	22m 39s

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