Fix invalid chars

[yjmantilla]

• CNT implementation. Closes problem with using .cnt files  #48 , but by requiring the latest dev version of mne-bids. Once they include it on the stable version we should ask for the stable one.
• Fixes bids_validator requirement missing in the user installation mode. This is used in heuristics.py.
• Now if an entity value has '_' or '-', they will be changed to '' automatically to adapt to the bids standard. In the future it would be nice for the user to choose which replacement to do.
• Now, files with problems for conversion or rules applying will be skipped and the corresponding error and filepath will be saved on the log.
• Typo correction. Closes correct typo in documentation #53

[codecov]

Codecov Report

Merging #55 (07d21ee) into main (ebf58a7) will decrease coverage by 0.30%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   83.01%   82.70%   -0.31%     
==========================================
  Files          15       15              
  Lines         736      746      +10     
==========================================
+ Hits          611      617       +6     
- Misses        125      129       +4     

Impacted Files	Coverage Δ
sovabids/datasets.py	45.63% <0.00%> (ø)
sovabids/convert.py	93.47% <60.00%> (-4.20%)	⬇️
sovabids/rules.py	89.16% <66.66%> (-0.71%)	⬇️
sovabids/parsers.py	92.00% <100.00%> (+0.33%)	⬆️

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