Add glTF 2.0 reader plugin
This merge request adds a new plugin that reads glTF 2.0 files.
Supported:
- Loading glTF 2.0 files
- Enabling/Disabling deformations
- Changing scenes
- Enabling/disabling/playing animations
- Animation sample rate adjustments
Not supported:
- Materials, textures, colors
Note: related VTK MR - vtk/vtk!5574 (merged)
Edited by Mathieu Westphal (Kitware)