Expected features:

• Help menu #20
• Save and load palettes #21
• Default palettes #22
• Configurable scale to export images #23
• Bucket: replace all areas with the color #25
• Bucket: adjustable tolerance #26
• Ovals and circles #27
• Transform: resize #28
• Transform: rotate #29
• Transform: change colors (hue, saturation, brightness, contrast, etc) #30
• Tile mode: repeat the image around the canvas to show how it would look as a tile #31