Overlays 1.1.0 and a new hashing algo!

[daveshanley]

Added support for the copy command on overlays 1.1.

This is a breaking change because the low-level model now has a different hashing algorithm and a different signature. We're no longer returning [32]byte instead it's a unit32

The new algorithm uses go's built-in maphash instead of SHA256. It's much, much, much more efficient. It runs about 15 times faster.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.50%. Comparing base (c579fac) to head (6417cb4).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #507    +/-   ##
========================================
  Coverage   99.50%   99.50%            
========================================
  Files         189      190     +1     
  Lines       22872    23013   +141     
========================================
+ Hits        22759    22900   +141     
  Misses         68       68            
  Partials       45       45            

Flag	Coverage Δ
unittests	99.50% <100.00%> (+<0.01%)	⬆️

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