Change OnEventSelected callbacks to be blocking invoke
Change OnEventSelected callbacks to be blocking invoke

* Fixes a race condition you could hit running from e.g. Python or some
  other non-UI thread.

Lssikkes/renderdoc,TurtleRockStudios/renderdoc_public,cgmb/renderdoc,Yours3lf/renderdoc,Velro/renderdoc,adrianbu/renderdoc,googlestadia/renderdoc,Velro/renderdoc,etnlGD/renderdoc,victor-moya/renderdoc,Yours3lf/renderdoc,Velro/renderdoc,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,Anteru/renderdoc,victor-moya/renderdoc,adrianbu/renderdoc,Yours3lf/renderdoc,adrianbu/renderdoc,googlestadia/renderdoc,Lssikkes/renderdoc,cgmb/renderdoc,googlestadia/renderdoc,michaelrgb/renderdoc,etnlGD/renderdoc,cgmb/renderdoc,adrianbu/renderdoc,Anteru/renderdoc,etnlGD/renderdoc,Yours3lf/renderdoc,TurtleRockStudios/renderdoc_public,TurtleRockStudios/renderdoc_public,Lssikkes/renderdoc,TurtleRockStudios/renderdoc_public,Lssikkes/renderdoc,Velro/renderdoc,moradin/renderdoc,Velro/renderdoc,michaelrgb/renderdoc,Anteru/renderdoc,michaelrgb/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,etnlGD/renderdoc,baldurk/renderdoc,moradin/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,Lssikkes/renderdoc,adrianbu/renderdoc,adrianbu/renderdoc,michaelrgb/renderdoc,moradin/renderdoc,Yours3lf/renderdoc,Anteru/renderdoc,Zorro666/renderdoc,michaelrgb/renderdoc,Zorro666/renderdoc,moradin/renderdoc,moradin/renderdoc,moradin/renderdoc,victor-moya/renderdoc,victor-moya/renderdoc,googlestadia/renderdoc,cgmb/renderdoc,Lssikkes/renderdoc,victor-moya/renderdoc,cgmb/renderdoc,etnlGD/renderdoc,Zorro666/renderdoc,etnlGD/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,Yours3lf/renderdoc,Anteru/renderdoc,Velro/renderdoc,Anteru/renderdoc,Anteru/renderdoc,baldurk/renderdoc,victor-moya/renderdoc