Add background to media controls

This actually required some help from James and Richard.  Thanks, guys!

This adds custom-drawing of a background image underneath the
icons that make up the media controls in the layout stack.
In order to have this work, we had to publicize API in lllayoutstack
to force relayout to calculate the size.

I also did another cleanup pass ("Boy Scout Rule") that
squirreled away all pertinent controls into membed variables,
instead of doing a getChild() every time updateShape() is called.

Readjusted a bunch of components as well.

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