Fixed issue where unbounded containers would grow infinitely when using the following display modes:
  * `DisplayMode.FillContainer`
  * `DisplayMode.FitContainer`
  * `DisplayMode.FitContainerAndFill`
  * `DisplayMode.FitContainerAndZoom`

This works by using CSS percent to fill the container instead of calculating the size which would cause n+1 resizing when setting the size. Viewport screen dimensions will now support percent based sizes