Use Event Aggregator with Revit

[adamhathcock]

Requires #505

[codecov]

Codecov Report

Attention: Patch coverage is 65.00000% with 161 lines in your changes missing coverage. Please review.

Project coverage is 13.76%. Comparing base (db4d2f7) to head (1a22343).
Report is 5 commits behind head on dev.

Files with missing lines	Patch %	Lines
...I3/Speckle.Connectors.DUI/Eventing/SpeckleEvent.cs	26.08%	32 Missing and 2 partials ⚠️
...UI3/Speckle.Connectors.DUI/Bridge/BrowserBridge.cs	0.00%	31 Missing ⚠️
...I3/Speckle.Connectors.DUI/ContainerRegistration.cs	0.00%	21 Missing ⚠️
...le.Connectors.DUI/Eventing/OneTimeThreadedEvent.cs	67.50%	10 Missing and 3 partials ⚠️
DUI3/Speckle.Connectors.DUI/Eventing/EventBase.cs	64.70%	11 Missing and 1 partial ⚠️
....Connectors.DUI/Bridge/TopLevelExceptionHandler.cs	54.16%	10 Missing and 1 partial ⚠️
...eckle.Connectors.DUI/Eventing/DelegateReference.cs	47.05%	6 Missing and 3 partials ⚠️
...e.Connectors.DUI/Eventing/EventSubscriptionSync.cs	68.42%	5 Missing and 1 partial ⚠️
...eckle.Connectors.DUI/Eventing/SubscriptionToken.cs	70.00%	5 Missing and 1 partial ⚠️
....Connectors.DUI/Eventing/EventSubscriptionAsync.cs	73.68%	5 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff            @@
##             dev     #502      +/-   ##
=========================================
+ Coverage   9.15%   13.76%   +4.61%     
=========================================
  Files        228      241      +13     
  Lines       4306     4672     +366     
  Branches     542      573      +31     
=========================================
+ Hits         394      643     +249     
- Misses      3896     4001     +105     
- Partials      16       28      +12     

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