UI overhaul

Converts the UI over to EC principles and introduces the Graphical
component.  This component is gathered whenever the Overlay is rendered
(after each frame, if an Overlay exists).

A graphical component extends Transform and provides 2 additional core
values:
- Media:  the media object to be rendered
- Anchor:  the alignment of the media object relative to the dimensions
of the overlay.

All graphical components who specify their translation sub-values
(per-axis) as being Floats will have that axis made relative again to
the appropriate axis of the overlay.  Ergo, a graphical may specify
absolute Y offset from the CENTER page anchor, but a -5% (-0.05) X
offset.

Additionally, String media objects will draw upon optional properties to
determine their color and font.