Offhand rendering fixes

[Lyfts]

Closes #27

And also fixes this sillyness where mc thinks both hands are in use while usingthe main hand item and holding something usable in the offhand

[github-actions]

Warning: 2 uncommitted changes
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[Caedis]

[DarianLStephens]

Oh, did this or the previous commit fix the issue where you see what was previously in your offhand when putting an item in to it after it had been emptied?
For example, if you put a torch in your offhand, then took them out, and later put a block of dirt in your offhand, you'd see the torch for a split second before it switched to rendering dirt?

EDIT: Ah, yes, that issue mentions it!