[ PROJECTIONS ] Generate (2D) contour lines after (isometric) projection

[mvdnet]

The clarity of isometric drawings can greatly be enhanced when contour edges are thicker.
OC does not generate contour lines when projecting. Outlines are not the same.
Find another way to identify contour lines, either directly related to projection or based on a collection of 2D edges.

NOTES:

• FreeBounds - https://dev.opencascade.org/doc/refman/html/class_shape_analysis___free_bounds.html
• FreeBounds::ConnectEdgesToWires()/ConnectWiresToWires()