v3.14.0

Feat

• add zoom feature (PR #553)
  • zoom-in feature
    • 
    • Drag or click to zoom-in!
  • zoom-out feature
    • 
    • Click zoom-out to return to the previous zoom level!
  • hand feature
    • 
    • Use the hand tool to move the canvas!
      • Or use space bar to turn on/off hand