Allow up to 5 data pushes in OP_RETURN outputs #1247

Job	Run time
Compilation for NanoS, X, S+, and Stax (nanos, $NANOS_SDK)	1m 45s
Compilation for NanoS, X, S+, and Stax (nanox, $NANOX_SDK)	1m 48s
Compilation for NanoS, X, S+, and Stax (nanosp, $NANOSP_SDK)	1m 47s
Compilation for NanoS, X, S+, and Stax (stax, $STAX_SDK)	2m 3s
Tests on mainnet (nanos)	34s
Tests on mainnet (nanox)	31s
Tests with the JS library	1m 30s
Tests with the Python library and legacy Bitcoin app	47s
Tests on mainnet (nanosp)	32s
Tests on mainnet (stax)	32s
Unit test	2m 19s
Tests for rust client library	1m 41s
	15m 49s

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