Swap improvements #1043

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 36s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	2m 6s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 50s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 9s
Unit test	1m 48s
Tests with the JS library	1m 17s
Tests (nanos)	8m 33s
Tests on mainnet (nanos)	44s
Tests (nanox)	8m 22s
Tests on mainnet (nanox)	30s
Tests (nanosp)	8m 19s
Tests on mainnet (nanosp)	28s
Tests with the Python library and legacy Bitcoin app	50s
Tests (stax)	49m 40s
Tests on mainnet (stax)	28s
Tests for rust client library	11m 27s
	1h 40m 7s

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