Refactored duplicate hash related code in tx.js and abstractblock.js#1130

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haxwell wants to merge 3 commits intobcoin-org:masterfrom

haxwell:jjames/refactor-duplicate-hash-code-impls

Commits on Jan 19, 2023

Refactored duplicate code related to hash() method in tx.js and abstractblock.js. Created a new class 'hasHashBehavior' that they inherit from.
haxwell
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Abstractblock.js, call super for the setHash() method.
haxwell
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Moved enc() up for ease of PR comparison, added comment.
haxwell
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