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Also adds a SHA256 method to CryptManager using LTC.
And at this point I realize we have picoSHA2 in our globals. So we could instead be removing all of LTC and move to use just that since I believe at this point most things in CryptManager are outdated/replaceable.
The motivation of this change was an update to chartkeys, which is why the decision to merge this might not be made until that change is taken seriously. The timing of this decision could be sooner rather than later.
Method of updating LTC directly inspired by stepmania/stepmania#1919