major redesign ob observations and entittes

environment/entity/mixin.py

@@ -0,0 +1,18 @@
+
+
+# noinspection PyAttributeOutsideInit
+class BoundEntityMixin:
+
+    @property
+    def bound_entity(self):
+        return self._bound_entity
+
+    @property
+    def name(self):
+        return f'{self.__class__.__name__}({self._bound_entity.name})'
+
+    def belongs_to_entity(self, entity):
+        return entity == self.bound_entity
+
+    def bind_to(self, entity):
+        self._bound_entity = entity