Added ThreadSafe-attribute for LayoutRenderer to optimize async Precalculate

[snakefoot]

When using AsyncWrapper then logger-threads will be able to precalculate-layouts concurrently without waiting for Target-lock.

• ${aspnet-request-url} now renders directly to StringBuilder
• ${aspnet-request} now also checks HasFormContentType. See also Check that Content-Type is correct before accessing the Form #322 (Also enabled unit tests for NetCore)

[codecov]

Codecov Report

Merging #326 into master will increase coverage by 1%.
The diff coverage is 89%.

@@          Coverage Diff          @@
##           master   #326   +/-   ##
=====================================
+ Coverage      62%    63%   +1%     
=====================================
  Files          32     32           
  Lines         454    438   -16     
  Branches       97     94    -3     
=====================================
- Hits          282    275    -7     
+ Misses        135    130    -5     
+ Partials       37     33    -4

Impacted Files	Coverage Δ
...nderers/AspNetUserIsAuthenticatedLayoutRenderer.cs	0% <ø> (ø)	⬆️
...ore/LayoutRenderers/AspNetMvcControllerRenderer.cs	40% <ø> (ø)	⬆️
...NetCore/LayoutRenderers/AspNetMvcActionRenderer.cs	40% <ø> (ø)	⬆️
...pNetCore/LayoutRenderers/AspNetRequestuseragent.cs	71% <ø> (ø)	⬆️
...LayoutRenderers/AspNetWebRootPathLayoutRenderer.cs	0% <ø> (ø)	⬆️
...LayoutRenderers/AspNetAppBasePathLayoutRenderer.cs	0% <ø> (ø)	⬆️
...e/LayoutRenderers/AspNetRequestIpLayoutRenderer.cs	0% <ø> (ø)	⬆️
...e/LayoutRenderers/AssemblyVersionLayoutRenderer.cs	38% <ø> (ø)	⬆️
...ayoutRenderers/AspNetUserAuthTypeLayoutRenderer.cs	67% <ø> (ø)	⬆️
...tRenderers/AspNetApplicationValueLayoutRenderer.cs	75% <ø> (ø)	⬆️
... and 13 more

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[snakefoot]

@304NotModified Fixed merge conflicts

[304NotModified]

👍

[304NotModified]

thanks!