${event-properties} - Added ObjectPath for extracting nested object property

[snakefoot]

Alternative implementation of #3318

${event-properties:myOrder:objectpath=OrderId}

Right now without fallback to case-insensitive lookup if the direct lookup fails.

[codecov-io]

Codecov Report

Merging #3329 into dev will increase coverage by <1%.
The diff coverage is 83%.

@@          Coverage Diff           @@
##             dev   #3329    +/-   ##
======================================
+ Coverage     80%     80%   +<1%     
======================================
  Files        356     356            
  Lines      28101   28170    +69     
  Branches    3743    3756    +13     
======================================
+ Hits       22517   22585    +68     
+ Misses      4503    4499     -4     
- Partials    1081    1086     +5

[304NotModified]

I think this is also better to have in ${event-properties} :)

[304NotModified]

cool! Merged!

[304NotModified]

docs -> https://github.com/NLog/NLog/wiki/EventProperties-Layout-Renderer