Replace H256 with the one in rust-numext#15

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joii2020 wants to merge 16 commits intonervosnetwork:masterfrom joii2020:dev_rep_H256

+220-274

Commits on Aug 31, 2021

Replace H256 with the one in rust-numext
joii2020
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Commits on Sep 1, 2021

Delete class H256 completely, use numext H256 instead.
joii2020
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Repair warning, delete two unused codes
joii2020
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The last time the format was changed, the CI problem has been resolved
joii2020
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Remove H256 from lib.rs and change it to SmtH256 to avoid confusion; merge H256Ord to avoid code duplication.
joii2020
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Revert "Remove H256 from lib.rs and change it to SmtH256 to avoid confusion; merge H256Ord to avoid code duplication."
joii2020
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The struce H256 is marked as pub(crate) and fix CI
joii2020
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merge H256Ord to h256.rs to avoid code duplication
joii2020
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Commits on Sep 8, 2021

remove std in features
joii2020
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Commits on Sep 15, 2021