Refactoring how Camera frame height and width are handled

mobject/mobject.py

@@ -199,6 +199,15 @@ class Mobject(Container):
         )
         return self
 
+    def apply_function_to_position(self, function):
+        self.move_to(function(self.get_center()))
+        return self
+
+    def apply_function_to_submobject_positions(self, function):
+        for submob in self.submobjects:
+            submob.apply_function_to_position(function)
+        return self
+
     def apply_matrix(self, matrix, **kwargs):
         # Default to applying matrix about the origin, not mobjects center
         if len(kwargs) == 0: