Separate start/end arrowheads for Lines, Arcs, Polylines and Splines

[#1]

For 2D drafting of items, such as stairs, walking paths, escape routes or diagrams, that indicate a start and an end, users will be able to use lines, arcs, polylines and splines with different arrowheads on both sides. (e.g. circle on start, arrow on end) This will provide greater flexibility for the supported element types.