`VisualizerUtilities::showMotion()` occasionally fails when animating models with `Scholz2015GeometryPath`

[nickbianco]

VisualizerUtilities::showMotion() occasionally fails when replaying a motion generated with models containing Scholz2015GeometryPath objects. For example, this test example in a personal benchmarking repository (where Gait3D.osim is a model generated with this utility) produces the following error when reaching VisualizerUtilities::showMotion():

libc++abi: terminating due to uncaught exception of type SimTK::Exception::ErrorCheck: SimTK Exception thrown at GeodesicIntegrator.h:163:
  Error detected by Simbody method GeodesicIntegrator::initialize(): Couldn't project constraints to tol=1e-09; largest error was 3.84291e-08.
  (Required condition '!"projection failed"' was not met.)

zsh: abort      ./sandbox

The error likely occurs because VisualizerUtilities::showMotion() internally resamples the states to maintain a specified framerate, which effectively changes the motion's step size and therefore the behavior of CableSpan internally.