25f781bef3 Implement p2pk_public_key + tests (connormullett) Pull request description: closes #1408 Adds logic to extract a `PublicKey` (if able) from a p2pk script ACKs for top commit: tcharding: ACK 25f781bef3 apoelstra: ACK 25f781bef3 Kixunil: ACK 25f781bef3 Tree-SHA512: 139f588ca4b6ccc45f8df0b35c19bebae66cb7b07cbad22bbf5d3059118ed54c8e1716d64dc528de59c7c8f4eb684944ce029fbce97a303f385281e990fc3bf0
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