NLogBeginScopeParser - Refactoring and improved exception handling

[snakefoot]

No description provided.

[codecov-io]

Codecov Report

Merging #289 into master will increase coverage by 0.03%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
+ Coverage   73.84%   73.88%   +0.03%     
==========================================
  Files          12       12              
  Lines        1086     1076      -10     
  Branches      190      191       +1     
==========================================
- Hits          802      795       -7     
+ Misses        220      219       -1     
+ Partials       64       62       -2

Impacted Files	Coverage Δ
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	80.95% <0%> (-0.6%)	⬇️
...Extensions.Logging/Logging/NLogBeginScopeParser.cs	65.75% <77.77%> (+1.27%)	⬆️
...ensions.Logging/Config/NLogLoggingConfiguration.cs	93.93% <97.14%> (+0.31%)	⬆️

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[304NotModified]

• I merged your changelog commit
• If I merge this one, the snupkg gets corrupt on nuget.org. :( (see Add Support for snupkg Symbol Packages appveyor/ci#2753 (comment)) Maybe we should update the version (as RC)?

[snakefoot]

Have bumped the version to 1.5.1-rc1

[304NotModified]

finally merged :)

[snakefoot]

Created #299 for you also :)

[304NotModified]

approved. Should merge automatically :)