Slider usage

Because kicking relayouts from light table seems to be quirky, I wanted
some on-page controls for messing with values. Just width and height
for now.
Mario-benchmark input

Also widen warp-window to accommodate large differences in sequence
length.
Mouseover for event info
Tabular tooltips

Totally tabular
Sort info columns by trace x-positions
Trace ID info footer

To make it easier to tell traces apart.
Also shorten Mario IDs.
Info table background colors
Successfully change SVG size during relayout
Parameter tweaks and new sliders

Also fade out info box when mouse moves away.
Refactor trace selection and infobox display
Highlight infobox-selected inputs and brush larger selections

No details are shown yet for boxed selections.
Parameter tweaks and cleanup