Add optimised fill!(::MutableMemoryView{UInt8}, ::UInt8)

[jakobnissen]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.85%. Comparing base (3ece65c) to head (08cb960).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
+ Coverage   97.81%   97.85%   +0.03%     
==========================================
  Files          10       10              
  Lines         321      326       +5     
==========================================
+ Hits          314      319       +5     
  Misses          7        7              

Flag	Coverage Δ
unittests	97.85% <100.00%> (+0.03%)	⬆️

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