Make basic writing and reading operations part of the read/write module

[markehammons]

Fixes #77

[codecov-commenter]

Codecov Report

Merging #78 (055cddf) into master (8e670bb) will decrease coverage by 1.86%.
The diff coverage is 53.96%.

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@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
- Coverage   63.20%   61.35%   -1.86%     
==========================================
  Files          48       49       +1     
  Lines        1340     1330      -10     
  Branches       20       20              
==========================================
- Hits          847      816      -31     
- Misses        493      514      +21     

Flag	Coverage Δ
unittests	61.35% <53.96%> (-1.86%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
core/src/fr/hammons/slinc/DescriptorOf.scala	33.33% <ø> (ø)
core/src/fr/hammons/slinc/Ptr.scala	0.00% <0.00%> (ø)
core/src/fr/hammons/slinc/TypeDescriptor.scala	0.00% <0.00%> (ø)
...rc/fr/hammons/slinc/modules/DependentTrieMap.scala	0.00% <0.00%> (ø)
.../fr/hammons/slinc/modules/DescriptorModule17.scala	91.78% <100.00%> (ø)
...c/fr/hammons/slinc/modules/ReadWriteModule17.scala	97.43% <100.00%> (+5.12%)	⬆️
.../fr/hammons/slinc/modules/DescriptorModule19.scala	88.46% <100.00%> (ø)
...c/fr/hammons/slinc/modules/ReadWriteModule19.scala	92.10% <100.00%> (+6.85%)	⬆️
j19/src/fr/hammons/slinc/Mem19.scala	82.69% <0.00%> (-7.70%)	⬇️
... and 2 more

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