Modomics Modificaiton Parsing

[nbollis]

Adds support for Modomics, an rna modificaiton database.

[codecov]

Codecov Report

❌ Patch coverage is 90.07092% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.96%. Comparing base (8ef787a) to head (0d13b96).

Files with missing lines	Patch %	Lines
...teomicsDatabases/Transcriptomics/ModomicsLoader.cs	90.00%	3 Missing and 9 partials ⚠️
mzLib/Omics/Modifications/Modification.cs	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #950      +/-   ##
==========================================
+ Coverage   80.93%   80.96%   +0.02%     
==========================================
  Files         268      271       +3     
  Lines       38491    38624     +133     
  Branches     4164     4185      +21     
==========================================
+ Hits        31151    31270     +119     
- Misses       6635     6640       +5     
- Partials      705      714       +9     

Files with missing lines	Coverage Δ
mzLib/Chemistry/Constants.cs	100.00% <100.00%> (ø)
...ib/Proteomics/AminoAcidPolymer/AminoAcidPolymer.cs	97.47% <100.00%> (ø)
mzLib/Transcriptomics/Nucleotide.cs	98.97% <ø> (ø)
...ProteomicsDatabases/Transcriptomics/ModomicsDto.cs	100.00% <100.00%> (ø)
mzLib/Omics/Modifications/Modification.cs	96.61% <60.00%> (-0.87%)	⬇️
...teomicsDatabases/Transcriptomics/ModomicsLoader.cs	90.00% <90.00%> (ø)

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