add possibility to use column headers with space and dash

[codecov[bot]]

Codecov Report

Merging #82 (bd27693) into master (66979b3) will increase coverage by 0.69%. The diff coverage is 100.00%.

:exclamation: Current head bd27693 differs from pull request most recent head c5920c4. Consider uploading reports for the commit c5920c4 to get more accurate results

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
+ Coverage     96.37%   97.07%   +0.69%     
- Complexity      177      179       +2     
============================================
  Files            29       29              
  Lines           441      478      +37     
============================================
+ Hits            425      464      +39     
+ Misses           16       14       -2     

Impacted Files	Coverage Δ
...odel/Configuration/AbstractImportConfiguration.php	91.66% <100.00%> (ø)
src/Model/Matrix/Matrix.php	100.00% <100.00%> (ø)
src/Model/Matrix/MatrixRecord.php	87.50% <100.00%> (+2.88%)	:arrow_up:
src/Service/PropertyExistenceChecker.php	100.00% <100.00%> (ø)
src/Utils/ColumnNameHelper.php	100.00% <100.00%> (ø)
...ator/Constraints/DatabaseEntityUniqueValidator.php	100.00% <100.00%> (+3.12%)	:arrow_up:

... and 10 files with indirect coverage changes

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