XicSpline toString

[zhuoxinshi]

added a toString method for XicSpline settings

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.94%. Comparing base (e1b1869) to head (f39acd4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #944   +/-   ##
=======================================
  Coverage   80.94%   80.94%           
=======================================
  Files         265      265           
  Lines       38331    38340    +9     
  Branches     4138     4138           
=======================================
+ Hits        31026    31035    +9     
  Misses       6607     6607           
  Partials      698      698           

Files with missing lines	Coverage Δ
...sSpectrometry/PeakIndexing/PeakSpline/XicSpline.cs	100.00% <100.00%> (ø)

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