Close #279 - Add Trunc and Frac functions

[sys27]

No description provided.

[codecov]

Codecov Report

Merging #280 into dev will increase coverage by 0.00%.
The diff coverage is 96.55%.

@@           Coverage Diff           @@
##              dev     #280   +/-   ##
=======================================
  Coverage   97.81%   97.81%           
=======================================
  Files         156      158    +2     
  Lines        5168     5223   +55     
=======================================
+ Hits         5055     5109   +54     
- Misses        113      114    +1     

Impacted Files	Coverage Δ
xFunc.Maths/Analyzers/Simplifier.cs	100.00% <ø> (ø)
xFunc.Maths/Expressions/Frac.cs	92.85% <92.85%> (ø)
xFunc.Maths/Expressions/Trunc.cs	92.85% <92.85%> (ø)
xFunc.Maths/Analyzers/Differentiator.cs	100.00% <100.00%> (ø)
...Func.Maths/Analyzers/Formatters/CommonFormatter.cs	100.00% <100.00%> (ø)
...Func.Maths/Analyzers/TypeAnalyzers/TypeAnalyzer.cs	99.82% <100.00%> (+<0.01%)	⬆️
xFunc.Maths/Expressions/Angles/Angle.cs	98.88% <100.00%> (+0.02%)	⬆️
xFunc.Maths/MathExtensions.cs	100.00% <100.00%> (ø)
xFunc.Maths/Parser.ExpressionFactory.cs	100.00% <100.00%> (ø)
... and 2 more

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