feat: add ysorting to battlesystem

sonic-radiance.love/scenes/battlesystem/world.lua

@@ -96,6 +96,7 @@ function World:draw()
 end
 
 function World:drawActors()
+  table.sort(self.actors, function(a, b) return (a.y < b.y) end)
   for i, actor in ipairs(self.actors) do
     actor:draw()
   end