Scrollable Comp Panel for Canvas Feature

Scrollable Comp Panel for Canvas Feature is a feature that allows an AE Comp Viewer to be used as a Visual Placeholder for other comps and assets. 

This will allow users to use a Canvas Composition to -
- create visual storyboards
- place multiple output sized comps into a single Canvas Composition for checking
- create a visual canvas for the different levels of a MoGraph Design System

Does not require realtime playback BUT will be good to be able to marquee select an area using Region of Interest to define a preview area.

Structurally, Canvas Compositions can be thought off as a Page-based System that allows the user to navigate from one Canvas Composition to another using a Page-Number or Name with visual links to Compositions and Assets and even Group of Layers within a Composition.

And add support for breakpoints so the user can easily go from/to vertical to/from horizontal views.