• Fix 32bit Python on 64bit OS ID type issues (see #316)
• BackgroundPlotter changes:
  • Window title (see #305)
  • Add callback support (see #304)
  • Fix closing issues (see #315)
  • Add offscreen support (see #309)
  • Fix window resizing issue (see #315)
• Fix typos
• Add null_value support for the .interpolate filter
• Replace AppVeyor with Azure Pipelines for Windows testing (see #317)
• Add more special array names to the exclusion list for active scalars (see #307)
• Update docstring for .add_text to detail how return type can vary (see #312)