feat: Make C library bindings support allocating returns.

[markehammons]

Fixes #106

[codecov-commenter]

Codecov Report

Merging #107 (ee172df) into master (ce66379) will decrease coverage by 0.07%.
The diff coverage is 74.19%.

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@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
- Coverage   59.59%   59.52%   -0.07%     
==========================================
  Files          63       64       +1     
  Lines        1663     1658       -5     
  Branches       24       24              
==========================================
- Hits          991      987       -4     
+ Misses        672      671       -1     

Flag	Coverage Δ
unittests	59.52% <74.19%> (-0.07%)	⬇️

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Impacted Files	Coverage Δ
...re/src/fr/hammons/slinc/CFunctionInformation.scala	0.00% <0.00%> (ø)
...c/fr/hammons/slinc/CFunctionBindingGenerator.scala	93.75% <92.30%> (+10.11%)	⬆️
j17/src/fr/hammons/slinc/modules/LibModule17.scala	85.71% <100.00%> (+17.29%)	⬆️
j19/src/fr/hammons/slinc/modules/LibModule19.scala	85.71% <100.00%> (+15.71%)	⬆️

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