scenes/levels: rename the bump world to "entities"

It'll prepare the naming of the world manager

imperium-porcorum.love/scenes/levels/controller/world.lua

@@ -3,7 +3,7 @@ local Obj = require "scenes.levels.entities"
 function Level:initWorld()
   self.map = Sti("assets/maps/" .. self.mapfile .. ".lua")
   self.obj = Obj
-  self.world = Bump.newWorld(50)
+  self.entities = Bump.newWorld(50)
   self.backcolor = self.map.backgroundcolor or {0, 0, 0}
   self.blocks = {} -- On vide la liste des blocks
 
@@ -109,23 +109,23 @@ function Level:isCollisionLayer(layername)
 end
 
 function Level:addEntity(entity)
-  return self.world:add(entity, entity.x, entity.y, entity.w, entity.h)
+  return self.entities:add(entity, entity.x, entity.y, entity.w, entity.h)
 end
 
 function Level:moveEntity(entity, x, y, filter)
-  return self.world:move(entity, x, y, filter)
+  return self.entities:move(entity, x, y, filter)
 end
 
 function Level:removeEntity(entity)
-  return self.world:remove(entity)
+  return self.entities:remove(entity)
 end
 
 function Level:queryRect(x, y, w, h)
-  return self.world:queryRect(x, y, w, h)
+  return self.entities:queryRect(x, y, w, h)
 end
 
 function Level:countEntities()
-  return self.world:countItems()
+  return self.entities:countItems()
 end
 
 function Level:worldUpdate(dt)
@@ -155,5 +155,5 @@ function Level:updateMap(dt)
 end
 
 function Level:getEntities()
-  return self.world:getItems()
+  return self.entities:getItems()
 end