Allow cloning ECPublicKey and make its fields pub #196

Job	Run time
Check code formatting	1m 16s
Build SDK	1m 41s
Build SDK (nanos)	2m 1s
Build SDK (nanox)	1m 59s
Build SDK (nanosplus)	2m 5s
Run static analysis (nanos, include_gif)	1m 18s
Run static analysis for cargo-ledger	1m 34s
Run static analysis (nanos, testmacro)	1m 16s
Run unit and integration tests (nanos)	2m 36s
Run static analysis (nanos, ledger_secure_sdk_sys)	1m 55s
Run unit and integration tests (nanox)	2m 31s
Run static analysis (nanos, ledger_device_sdk)	1m 58s
Run unit and integration tests (nanosplus)	2m 38s
Run static analysis (nanox, include_gif)	1m 20s
Run static analysis (nanox, testmacro)	1m 35s
Run static analysis (nanox, ledger_secure_sdk_sys)	2m 2s
Run static analysis (nanox, ledger_device_sdk)	1m 59s
Run static analysis (nanosplus, include_gif)	1m 19s
Run static analysis (nanosplus, testmacro)	1m 24s
Run static analysis (nanosplus, ledger_secure_sdk_sys)	1m 49s
Run static analysis (nanosplus, ledger_device_sdk)	2m 7s
	38m 23s

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