Implement method "Set Power On Auto Load" (15)

[rzbrk]

Implement method "Set Power On Auto Load" (15), see: https://github.com/rzbrk/VoiceRecognitionV3#set-power-on-auto-load-15

[rzbrk]

The command "Set Power On Auto Load" allows to specify records that will be loaded to the recognizer directly when the module is powered. The command will take effect only after power cycling.

Tests show, that the command does not check if the records are trained. The command will executed with nominal response message but will have no effect after power cycling. The consequence is that no record will be automatically loaded to the recognizer and the module will not enter "recognition mode"

I don't like this behavior of the firmware. The Python driver already features the method check_record_train_status() to check the train status of a record. I plan to use this method to check the train status for every record specified when calling method set_power_on_auto_load(). In the case one record is not trained the method shall raise an error.

[rzbrk]

ToDos:

• [x] Implement method set_power_on_auto_load()
• [ ] Implement unit tests
• [ ] Update documentation