improve creation of stim file and their conversion to raw

[Remi-Gau]

• creates test for remove date suffix
• improves removing date suffix for zipped files like the stim ones

fix #17

[codecov]

Codecov Report

Merging #71 into master will increase coverage by 0.37%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   76.29%   76.66%   +0.37%     
==========================================
  Files          17       19       +2     
  Lines         405      420      +15     
==========================================
+ Hits          309      322      +13     
- Misses         96       98       +2     

Flag	Coverage Δ
#unittests	76.66% <50.00%> (+0.37%)	⬆️

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Impacted Files	Coverage Δ
src/convertSourceToRaw.m	0.00% <ø> (ø)
src/subfun/parseFunc.m	0.00% <0.00%> (ø)
src/subfun/removeDateSuffix.m	90.90% <90.90%> (ø)
src/saveEventsFile.m	85.21% <100.00%> (+1.88%)	⬆️

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[Remi-Gau]

This CI was harder to set up than I expected