Allow up to 5 data pushes in OP_RETURN outputs #1244

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 48s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 56s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 44s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	1m 58s
Tests with the Python library and legacy Bitcoin app	50s
Tests on mainnet (nanos)	32s
Tests with the JS library	1m 26s
Tests on mainnet (nanox)	36s
Tests for rust client library	1m 39s
Unit test	1m 52s
Tests on mainnet (nanosp)	33s
Tests on mainnet (stax)	31s
	15m 25s

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