Reconcile BlS gravelsieve updates with original techpack upgrades#91

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oversword wants to merge 5 commits intojoe7575:masterfrom

oversword:gravelsieve-reconcile

Commits on Jun 25, 2021

Reconcile BlS gravelsieve updates with original techpack upgrades
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Undo readme deletion
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Commits on Jun 27, 2021

Reconcile with some changes in the original
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Commits on Jul 15, 2021