Open VKL v1.2.0

• Added vklSetParam() API function which can set parameters of any supported type
• Structured regular volumes:
  • Added support for cell-centered data via the cellCentered parameter; vertex-centered remains the default
  • Added support for more general transformations via the indexToObject parameter
  • Added indexOrigin parameter which applies an index-space vec3i translation
• VDB volumes:
  • Added indexClippingBounds parameter, which can restrict the active voxel bounding box
  • The indexToObject parameter can now be provided as a VKL_AFFINE3F
  • Corrected bounding box computations in InnerNode observer
• Particle volumes:
  • Now ignoring particles with zero radius
• VDB utility library: added commit flag (default true) to volume creation methods, allowing apps to set additional parameters before first commit
• Examples:
  • Added new set of minimal examples, which step through creation of basic volume and isosurface renderers
  • Exposing intervalResolutionHint parameter in vklExamples application
• Superbuild updates to latest versions of dependencies