Show trigger size + shape

[SenorRagequit]

Enter your feature description.

Some entities got Triggers (as a child f.e)

    children
    {
        EntityBlueprint
        {
            name "buildings/defense/wall_gate/trigger"

            AttachmentDesc
            {
                attachment "att_door"
            }

            TriggerDesc
            {
                owner       "parent"
                type        "GRID"

                collision   "character"
                Shapes
                {
                    PhysicsSphereShape
                    {
                        r "6"
                    }
                }
            }
        }

and it would be very handy to see that size + shape in the model editor. Maybe as a new button on the side, like we got with Physics stuff.

[lukaasm]

Duplicate #357