Swap improvements #1031

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 46s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 55s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 36s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	1m 42s
Tests on mainnet (nanos)	29s
Tests with the Python library and legacy Bitcoin app	25s
Tests on mainnet (nanox)	32s
Tests (nanos)	28s
Tests on mainnet (nanosp)	29s
Unit test	1m 44s
Tests (nanox)	24s
Tests on mainnet (stax)	32s
Tests (nanosp)	26s
Tests (stax)	28s
Tests with the JS library	2m 2s
Tests for rust client library	6m 52s
	21m 50s

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