message: Update README and CHANGELOG for release
diff: Version History
  ---------------
  +### Changes in OSPRay Studio v0.8.0
  +
  +- Compatible with OSPRay release v2.7.x
  +- GitHub release binaries are built with python bindings for Python 3.7
  +
  +- Features/Improvments
  + - Support for OSPRay's camera Motion Blur and Transformation Motion Blur for animated glTF scenes
  + - Support for UDIM texture tiling workflow
  + - New transfer functions and color maps for volume rendering
  + - Much improved search widget for scene objects and materials
  + - Large scene performance optimization
  + - Added ImGui docking and viewport support (experimental)
  + - Updated external 3rd party dependencies bringing in features and bug fixes
  + - Modified OBJ importer to parse and use quads and triangles
  + - Improved Arcball camera navigation with up-vector lock
  +
  +- Bugs Fixes
  + - Fixed materials after clearing scene
  + - Fixed materials for PointCloudData (PCD)
  + - Can no longer create a zero-dimension framebuffer
  + - Fixed instancing node-naming to allow for for many identical instances
  + - Fixed crash if optional glTF punctual light color was omitted
  + - Fixed crash if isosuface geometry is used as clipping geometry when no other
  + geometries are in the scene
  +
  ### Changes in OSPRay Studio v0.7.0
  - Compatible with OSPRay release v2.6.x
  