Made ServiceLocator public

[304NotModified]

to support other DI systems

fixes #227

[codecov]

Codecov Report

Merging #231 into master will decrease coverage by 1%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #231   +/-   ##
=====================================
- Coverage      59%    58%   -1%     
=====================================
  Files          29     29           
  Lines         395    395           
  Branches       92     92           
=====================================
- Hits          233    231    -2     
  Misses        126    126           
- Partials       36     38    +2

Impacted Files	Coverage Δ
...etCore/LayoutRenderers/AspNetLayoutRendererBase.cs	88% <ø> (ø)	⬆️
...e/LayoutRenderers/IISInstanceNameLayoutRenderer.cs	0% <ø> (ø)	⬆️
...youtRenderers/AspNetRequestCookieLayoutRenderer.cs	80% <0%> (-4%)	⬇️
...outRenderers/AspNetLayoutMultiValueRendererBase.cs	96% <0%> (-2%)	⬇️

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