Swap improvements #1033

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)	1m 52s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 36s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	1m 51s
Unit test	3m 23s
Tests (nanos)	10m 7s
Tests (nanox)	8m 13s
Tests on mainnet (nanos)	41s
Tests (nanosp)	11m 32s
Tests on mainnet (nanox)	29s
Tests (stax)	49m 6s
Tests with the JS library	1m 52s
Tests with the Python library and legacy Bitcoin app	43s
Tests on mainnet (nanosp)	28s
Tests on mainnet (stax)	29s
Tests for rust client library	9m 42s
	1h 43m 40s

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