Swap improvements #1029

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 53s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 41s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 50s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	1m 58s
Tests (nanos)	7m 30s
Tests (nanox)	7m 35s
Unit test	1m 50s
Tests (nanosp)	7m 33s
Tests on mainnet (nanos)	28s
Tests (stax)	7m 33s
Tests on mainnet (nanox)	40s
Tests on mainnet (nanosp)	27s
Tests on mainnet (stax)	29s
Tests with the JS library	1m 25s
Tests with the Python library and legacy Bitcoin app	1m 6s
Tests for rust client library	10m 52s
	54m 50s

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