removed positionmix entirely (now also in collection)

marl_factory_grid/modules/machines/groups.py

@@ -1,14 +1,23 @@
 from marl_factory_grid.environment.groups.collection import Collection
-from marl_factory_grid.environment.groups.mixins import PositionMixin
 
 from .entitites import Machine
 
 
-class Machines(PositionMixin, Collection):
+class Machines(Collection):
 
     _entity = Machine
-    is_blocking_light: bool = False
-    can_collide: bool = False
+
+    @property
+    def var_can_collide(self):
+        return False
+
+    @property
+    def var_is_blocking_light(self):
+        return False
+
+    @property
+    def var_has_position(self):
+        return True
 
     def __init__(self, *args, **kwargs):
         super(Machines, self).__init__(*args, **kwargs)