[ENH] options are saved in a cfg folder in the working directory

[Remi-Gau]

To avoid cluttering the working directory.

• options for a given analysis are saved in a cfg folder in the working directory
• load and check will also check for options to load in this foled
• move options*.json files of the demos into cfg folders
• update tests

[Remi-Gau]

fixes #301

[codecov]

Codecov Report

Merging #308 (a7be094) into dev (c3511c7) will decrease coverage by 0.07%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##              dev     #308      +/-   ##
==========================================
- Coverage   62.66%   62.58%   -0.08%     
==========================================
  Files         108      108              
  Lines        1714     1716       +2     
==========================================
  Hits         1074     1074              
- Misses        640      642       +2     

Impacted Files	Coverage Δ
src/utils/saveOptions.m	0.00% <0.00%> (ø)
src/utils/loadAndCheckOptions.m	95.45% <100.00%> (ø)

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