arena replace weapons with more generic items

entities/items/item.py

@@ -4,9 +4,10 @@ from entities import resource as _resource
 class BrSimItem(_resource.BrSimResource):
 
   # test 
-  def __init__(self):
+  def __init__(self, item):
     self.coord_x= 0
     self.coord_y= 0
+    self.item= item
 
   def is_item(self):
     return True