Add Scrolling layout option.

[melair]

Create a Displayable which creates a bigger area then it's parent, the layout can then manually scroll the display by shifting it's view over the whole area.

• Horizontal Only? You could get a vertical by mounting a horizontal in a rotate.
• Speeds?
• Repeat options:
  • Continuous loop
  • Bounce from side to side.
  • Just resets to beginning.
• Allow smart sizing, where size adapts to the most right hand none black pixel.