Update Handling of Sequence Variants (Part 6): SequenceVariant AreValid

[trishorts]

the existing method for evaluating if a sequence variant is valid just isn't up to snuf. This PR adds improved bool for AreValid that considers all changes at the sequence and modification level of a variant

[codecov]

Codecov Report

❌ Patch coverage is 69.58175% with 80 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.87%. Comparing base (57f1327) to head (5cac61f).
⚠️ Report is 64 commits behind head on master.

Files with missing lines	Patch %	Lines
mzLib/Omics/BioPolymer/SequenceVariation.cs	56.75%	22 Missing and 10 partials ⚠️
mzLib/Omics/BioPolymer/VariantApplication.cs	64.19%	20 Missing and 9 partials ⚠️
mzLib/UsefulProteomicsDatabases/ProteinXmlEntry.cs	88.54%	7 Missing and 4 partials ⚠️
...Databases/DecoyGeneration/DecoyProteinGenerator.cs	12.50%	0 Missing and 7 partials ⚠️
...micsDatabases/DecoyGeneration/RnaDecoyGenerator.cs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
- Coverage   81.00%   80.87%   -0.13%     
==========================================
  Files         269      269              
  Lines       38826    38957     +131     
  Branches     4241     4272      +31     
==========================================
+ Hits        31450    31508      +58     
- Misses       6640     6692      +52     
- Partials      736      757      +21     

Files with missing lines	Coverage Δ
mzLib/Omics/BioPolymer/VariantCallFormat.cs	86.95% <ø> (ø)
mzLib/UsefulProteomicsDatabases/ProteinDbWriter.cs	95.48% <100.00%> (ø)
...micsDatabases/DecoyGeneration/RnaDecoyGenerator.cs	83.72% <50.00%> (ø)
...Databases/DecoyGeneration/DecoyProteinGenerator.cs	90.79% <12.50%> (ø)
mzLib/UsefulProteomicsDatabases/ProteinXmlEntry.cs	96.78% <88.54%> (-2.75%)	⬇️
mzLib/Omics/BioPolymer/VariantApplication.cs	79.37% <64.19%> (-2.40%)	⬇️
mzLib/Omics/BioPolymer/SequenceVariation.cs	66.93% <56.75%> (-19.03%)	⬇️

... and 1 file with indirect coverage changes

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