use mzlib LibrarySpectrum class

[trishorts]

mzLib has a LibrarySpectrum class. Therefore, we eliminate the redundant LibrarySpectrum class from MetaMorpheus.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e1a30d7) 92.65% compared to head (18cf0ba) 92.64%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2349      +/-   ##
==========================================
- Coverage   92.65%   92.64%   -0.02%     
==========================================
  Files         137      136       -1     
  Lines       21274    21211      -63     
  Branches     2928     2923       -5     
==========================================
- Hits        19712    19650      -62     
  Misses       1083     1083              
+ Partials      479      478       -1     

Files	Coverage Δ
MetaMorpheus/EngineLayer/PsmTsv/PsmFromTsv.cs	96.84% <ø> (ø)
.../SpectralLibrarySearch/CrosslinkLibrarySpectrum.cs	94.38% <100.00%> (ø)
...gineLayer/SpectralLibrarySearch/SpectralLibrary.cs	87.14% <ø> (ø)
...tralLibrarySearch/SpectralLibrarySearchFunction.cs	98.76% <ø> (ø)
...etaMorpheus/GuiFunctions/MetaDraw/MetaDrawLogic.cs	95.74% <ø> (ø)
...taDraw/SpectrumMatch/CrosslinkSpectrumMatchPlot.cs	96.10% <ø> (ø)
...MetaDraw/SpectrumMatch/PeptideSpectrumMatchPlot.cs	97.40% <ø> (ø)
...ctions/MetaDraw/SpectrumMatch/SpectrumMatchPlot.cs	95.20% <ø> (ø)
MetaMorpheus/TaskLayer/MetaMorpheusTask.cs	88.57% <ø> (ø)
...eus/TaskLayer/SearchTask/PostSearchAnalysisTask.cs	93.36% <ø> (ø)
... and 1 more