Stunner - Create Association Sprite Icon

A proper sprite icon is required for modelling "associations" in the Designer toolbox.

In the attached screenshot we can see how the "associations" will look like (the dashed line) and how the "sequence flow" looks like right now (the solid line).

Additionally in the toolbox icons we can see how the sprite icon looks like for the "sequence flow". What we need is a similar dashed sprite icon for the "associations".