BUG: Fix linux events, keys and mouse

Andrew Wilsonrequested to merge
andrew.wilson/iMSTK:LinuxKeyFix into master

Key events weren't working in iMSTK since the move to manually calling VTK process events on the interactor.

Turns out there is a bug in VTK 9.0 vtkXRenderWindowInteractor::ProcessEvents which prevents it from working. vtk/vtk!6687 (merged)

This MR introduces the VTK fixes in iMSTK, we can use these until we update to VTK 10, whenever that releases.

Edited by Andrew Wilson

Merge request reports