HDX/AV: Small features/UI improvements for all points closest pairs

[jteresco]

• [ ] Display waypoint labels for v1 and v2 AVCP entries.
• [ ] Possibly pick a new color for the closest so far to the current v1 that is different from the colors for the segments connecting points to their already-computed closest neighbors.
• [ ] Add a label above the table of points, their closest neighbor, and distance.
• [ ] Styling of the header row for the table of points, their closest neighbor, and distance (more like what we have for the spanning tree tables in BFS, DFS, Dijkstra, etc.).
• [ ] Might reduce the opacity of the segments connecting points to their nearest neighbors to make it more obvious when there are two such lines drawn. Alternately, show this situation with a different color.

[jteresco]

@markverrajr1701 Are any of these items we can easily address before this AV goes into production?