Feature/Plugin Request - Add breakpoints option

[kodie]

This feature would allow for different settings to be applied depending on the width of the browser window. These options would also get updated if the browser window gets resized.

new WinBox({
  title: 'The browser window is small',
  top: 50,
  left: 50,
  width: 200,
  height: 200,
  breakpoints: {
    '768': {
        title: 'The browser window is atleast 768px wide',
        top: 100,
        left: 100,
        width: 600,
        height: 600
    }
  }
})

This could be implemented in core or as a plugin but I'd be happy to do it.