anchor: love.mousereleased
  Callback function triggered when a mouse button is released.
  love.mousereleased( x, y, button, istouch, presses )
  x number Mouse x position, in pixels.
  y number Mouse y position, in pixels.
  button number The button index that was released. 1 is the primary mouse button, 2 is the secondary mouse button and 3 is the middle button. Further buttons are mouse dependent.
  istouch boolean True if the mouse button release originated from a touchscreen touch-release.
  presses number The number of presses in a short time frame and small area, used to simulate double, triple clicks