Added object-name c-string getter function to basic objects so they can be referenced to free if dynamically created. (#754)

* Added basic object-name get for ASCII names to enable free if they were dynamically created. Added unit testing to validate the basic object ASCII object-name API.

* Removed static scope on character array used for name since the array gets copied into characterstring array and static is not needed.

test/bacnet/basic/object/msv/src/main.c

@@ -41,6 +41,10 @@ static void testMultistateValue(void)
         OBJECT_MULTI_STATE_VALUE, object_instance,
         Multistate_Value_Property_Lists, Multistate_Value_Read_Property,
         Multistate_Value_Write_Property, skip_fail_property_list);
+    bacnet_object_name_ascii_test(
+        object_instance,
+        Multistate_Value_Name_Set,
+        Multistate_Value_Name_ASCII);
     status = Multistate_Value_Delete(object_instance);
     zassert_true(status, NULL);
 }