Use Event Aggregator with Revit

[adamhathcock]

replaces #502

updates Revit to use Event Aggregator
EA can now have static handlers again

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 4 lines in your changes missing coverage. Please review.

Project coverage is 15.86%. Comparing base (4b5f398) to head (08e89d3).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...tShared/Settings/RevitConversionSettingsFactory.cs	0.00%	2 Missing ⚠️
...le.Connectors.DUI/Eventing/OneTimeThreadedEvent.cs	84.61%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #513      +/-   ##
==========================================
+ Coverage   14.74%   15.86%   +1.12%     
==========================================
  Files         239      238       -1     
  Lines        4674     4721      +47     
  Branches      576      578       +2     
==========================================
+ Hits          689      749      +60     
+ Misses       3954     3942      -12     
+ Partials       31       30       -1     

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