GLSP Tool Pallete missing entity and relationship not working

[harmen-xb]

There are 2 issues with the tool pallette:

1. The Diagram Tool Palette is missing the option to add an entity.
2. The relationship is in the tool palette, but it's not working. When you click on it you cannot drag a line between 2 entities. You have to click the first and then the second entity.

This is probably broken for a while already, or has never worked. In PR #28 I see the entity option is also not there.

[harmen-xb]

Small update, I misunderstood how to use the relationship :). Apparantly you first have to click on the first node and then click on the second. I was draging from the first to the second (which how most modeling tools work in my experience), but this doesn't work.