Selection Outline

I would lower the intensity, and maybe try/allow different colors. Otherwise, this will be handy. 

Will this be a part of the engine SDK? I would like to simply highlight entities with one method and a few arguments,

There's already an Entity::SetSelected method, but it doesn't really do anything. The next build will include a post-processing effect that outlines selected objects like this.

I was under the impression that that selection method would just turn it red like it did in Leadwerks. 

This would be really good for items and pickups like in Left 4 Dead and such.