different colors for different bbox objects

[plusk01]

When there is a large density of targets in a single area it would be nice if each box had it's own color that was consistent with its instance of AnnotatedObjectControls DOM elements.

[plusk01]

And add an element like

<color>
  <B>255</B>
  <G>0</G>
  <R>255</R>
</color

To keep colors consistent across vmtt_annotation_tools.