Continuous integration

Re-import PSBTv0 code from `rust-bitcoin` and `rust-miniscript` #97

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Run time

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Job	Run time
Test - stable toolchain	43s
Test - beta toolchain	2m 9s
Test - 1.56.1 toolchain	6m 9s
Test - nightly toolchain	2m 24s
	11m 25s