v_32: Event registration and data object methods

Add the following methods:

• get_events
• register_event
• add_data_object_to_key
• remove_data_object_to_key
• add_data_object_to_machine
• remove_data_object_to_machine
• list_machine_data_objects
• list_key_data_objects

Thanks to @synominit for the data object related methods.