Readme.

• Esc to pop out to new cursor
• Delete to delete the current cursor
• Double-click a cursor to switch to its perspective
• Hold shift and drag to select other cursors
  • Moving moves selected cursors
  • Clicking clicks selected cursors
  • Esc to release selected cursors
• Click a color swatch to pick up the color payload
• With a color, click and drag to draw
• Right-click to drop your current color payload

Uses perfect-freehand for drawing.