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Handle timers and multiple interactors in ProcessEvents

Jaswant Panchumarti requested to merge jspanchu/vtk:fix-x11-process-events-timer into master

This fixes vtk x11 ProcessEvents inconsistent behavior and allows those who write custom event loops to leverage timer support in VTK (JoystickCamera, etc)

  1. Simply move out the event loop code into ProcessEvents, so that it works just like one iteration of StartEventLoop.
  2. Use ProcessEvents in StartEventLoop.

I've tested that this change does not break previously fixed Regression on multiple render windows with VTK9 on a Linux system (CentOS 8, X.Org version: 1.12.2)

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