Dev fred ij version reader update

[remocristoforetti]

Update the FRED engine to include readout functionalities with new versions of the ij-scorers output files

[codecov]

Codecov Report

Attention: Patch coverage is 34.45378% with 78 lines in your changes missing coverage. Please review.

Project coverage is 52.26%. Comparing base (fdf2906) to head (39f749d).
Report is 6 commits behind head on dev.

Files with missing lines	Patch %	Lines
...Rad_ParticleFREDEngine/matRad_ParticleFREDEngine.m	25.25%	74 Missing ⚠️
...+DoseEngines/@matRad_ParticleFREDEngine/calcDose.m	25.00%	3 Missing ⚠️
...ines/@matRad_ParticleFREDEngine/writeRegionsFile.m	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #825      +/-   ##
==========================================
- Coverage   52.40%   52.26%   -0.14%     
==========================================
  Files         612      612              
  Lines       38702    38918     +216     
==========================================
+ Hits        20282    20342      +60     
- Misses      18420    18576     +156     

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