Use codeunits over unsafe_wrap

[jakobnissen]

Small internal change that avoids the use of pointers and unsafe_wrap.
For some reason I see a 1% performance drop. The code SHOULD perform identical.

[codecov]

Codecov Report

Merging #239 (34e14a2) into master (bf4aac5) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
+ Coverage   89.25%   89.29%   +0.03%     
==========================================
  Files          31       31              
  Lines        2430     2429       -1     
==========================================
  Hits         2169     2169              
+ Misses        261      260       -1     

Flag	Coverage Δ
unittests	89.29% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
src/longsequences/constructors.jl	100.00% <100.00%> (ø)
src/bit-manipulation/bitpar-compiler.jl	70.83% <0.00%> (+0.83%)	⬆️

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