Add String.Equals with StringComparison

[StefH]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.80608% with 61 lines in your changes are missing coverage. Please review.

Project coverage is 47.55%. Comparing base (63ec144) to head (7fa6ced).

Files	Patch %	Lines
...rc/Handlebars.Net.Helpers/Helpers/StringHelpers.cs	79.01%	35 Missing and 16 partials :warning:
src/Handlebars.Net.Helpers.Core/Utils/EnumUtils.cs	58.82%	4 Missing and 3 partials :warning:
src/Handlebars.Net.Helpers/Helpers/MathHelpers.cs	0.00%	2 Missing :warning:
...lebars.Net.Helpers.Core/Parsers/ArgumentsParser.cs	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   47.37%   47.55%   +0.17%     
==========================================
  Files          44       45       +1     
  Lines        2877     2900      +23     
  Branches      406      411       +5     
==========================================
+ Hits         1363     1379      +16     
- Misses       1390     1394       +4     
- Partials      124      127       +3     

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