modules/world: fix movement functions for bump2D

The moveActor function is in bump2D a wrapper for the move function of
bump2D. But this function doesn't handle actual movement.

In order to make things samewise everywhere, let the actor handle actual
movement themselves.

gamecore/modules/world/actors/actor2D.lua

@@ -84,7 +84,8 @@ function Actor2D:autoMove()
 end
 
 function Actor2D:move(newx, newy)
-  self.world:moveActor(self, newx, newy)
+  local cols, colNumber
+  self.x, self.y, cols, colNumber = self.world:moveActor(self, newx, newy)
 end
 
 -- DRAW FUNCTIONS

gamecore/modules/world/baseworld.lua

@@ -81,8 +81,6 @@ function BaseWorld:removeActor(actor)
 end
 
 function BaseWorld:moveActor(actor, x, y, filter)
-  actor.x = x
-  actor.y = y
   -- as the baseworld have no collision function, we return empty collision
   -- datas, but from the same type than bump2D will return
   return x, y, {}, 0