Merge pull request #231 from LedgerHQ/xch/simplify-cx-calls #1114

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 47s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 57s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 52s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 5s
Tests with the Python library and legacy Bitcoin app	48s
Unit test	2m 17s
Tests (nanos)	8m 24s
Tests on mainnet (nanos)	34s
Tests (nanox)	9m 6s
Tests on mainnet (nanox)	32s
Tests (nanosp)	8m 59s
Tests on mainnet (nanosp)	34s
Tests (stax)	51m 24s
Tests with the JS library	1m 28s
Tests on mainnet (stax)	32s
Tests for rust client library	1m 38s
	1h 33m 57s

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