Add support for SIN masternodes with x25x_hash algorithm#350

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barrystyle wants to merge 4 commits intotpruvot:nextfrom

barrystyle:sinnode

Commits on May 30, 2019

Implement x25x_hash into stratum, with supporting scripts
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Implement SINnode methods for coinbase.cpp
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Handle x25x_hash algorithm and port in web-interface
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Commits on May 31, 2019

Confirm blockhash correctly using x22i_hash after initial accept
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