Cat/Player Riding

Right now collision allows players to jump and stand on top of enemies and also other players. When the thing they are standing on moves, they move right out from underneaith them. We should implement "riding" so that when the thing your standing on moves it also moves whatever is on top of it. It would probably be best to do a manual check to see if anything is on a player or enemies head and add the force of the the "ridee" to the velocity of the "rider." Also will have to check this with turrets too. Maybe it is better to have anything that can "ride" check what it is standing on and have the logic there. Then the ridee doesn't need to know about the "rider." That is probably better.