Swap improvements #1036

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 39s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 58s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 38s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 46s
Tests with the Python library and legacy Bitcoin app	40s
Unit test	1m 37s
Tests (nanos)	8m 33s
Tests on mainnet (nanos)	44s
Tests (nanox)	10m 4s
Tests with the JS library	1m 23s
Tests on mainnet (nanox)	50s
Tests (nanosp)	8m 6s
Tests on mainnet (nanosp)	45s
Tests for rust client library	7m 4s
Tests (stax)	1h 5m 6s
Tests on mainnet (stax)	43s
	1h 53m 36s

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