Give Interactions their own layer modeled after how physics layers work

[Zach777]

[Moonwards]

@Zach777 could you expand on this a little? How would this affect the game? What does it achieve?

I'm looking for a sense of how this needs to fit in to overall plans.

[Zach777]

@Moonwards It will allow us to only show possible interactions when we should. It would fix Rovers thinking they can grab stairs. Thankfully Interactions system is engineered well. The hardest part will be getting the displays to work with the layers.