Swap improvements #1035

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 33s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 43s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 59s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	1m 45s
Tests (nanos)	7m 27s
Unit test	3m 44s
Tests (nanox)	8m 5s
Tests with the Python library and legacy Bitcoin app	41s
Tests on mainnet (nanos)	36s
Tests (nanosp)	8m 25s
Tests on mainnet (nanox)	30s
Tests (stax)	49m 14s
Tests on mainnet (nanosp)	46s
Tests with the JS library	1m 19s
Tests on mainnet (stax)	50s
Tests for rust client library	9m 10s
	1h 37m 47s

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