[REF] refactor the way the ROIs are saved

[Remi-Gau]

closes #43

[codecov]

Codecov Report

Merging #44 (586a235) into dev (5ff89c8) will increase coverage by 0.05%.
The diff coverage is 94.11%.

❗ Current head 586a235 differs from pull request most recent head 68a541e. Consider uploading reports for the commit 68a541e to get more accurate results

@@            Coverage Diff             @@
##              dev      #44      +/-   ##
==========================================
+ Coverage   89.78%   89.84%   +0.05%     
==========================================
  Files          23       23              
  Lines         509      512       +3     
==========================================
+ Hits          457      460       +3     
  Misses         52       52              

Flag	Coverage Δ
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Impacted Files	Coverage Δ
src/roi/plotDataInRoi.m	96.93% <93.75%> (+0.23%)	⬆️
src/roi/createRoi.m	92.10% <100.00%> (-0.27%)	⬇️

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