improve user input

[Remi-Gau]

• add tests
• decouple implementation
• add gui

[codecov]

Codecov Report

Merging #74 into master will increase coverage by 1.59%.
The diff coverage is 54.54%.

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   76.58%   78.17%   +1.59%     
==========================================
  Files          19       26       +7     
  Lines         427      472      +45     
==========================================
+ Hits          327      369      +42     
- Misses        100      103       +3     

Flag	Coverage Δ
#unittests	78.17% <54.54%> (+1.59%)	⬆️

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

Impacted Files	Coverage Δ
src/subfun/askUserCli.m	0.00% <0.00%> (ø)
src/subfun/askUserGui.m	0.00% <0.00%> (ø)
src/subfun/returnHeaderName.m	100.00% <ø> (ø)
src/userInputs.m	0.00% <0.00%> (ø)
src/subfun/askForGroupAndOrSession.m	100.00% <100.00%> (ø)
src/subfun/createQuestionList.m	100.00% <100.00%> (ø)
src/subfun/getIsQuestionToAsk.m	100.00% <100.00%> (ø)
src/subfun/isPositiveInteger.m	100.00% <100.00%> (ø)
src/subfun/setDefaultResponses.m	100.00% <100.00%> (ø)
... and 6 more

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