add get-config and update-config commands

[wouterteepe]

The current codebase does not yet expose the endpoints /config for retrieval and modifications.

This patch addresses that, and adds

get-config
update-config

It exposes a wide collection of settings to be altered, including notably the "NightBoost" setpoint, and toggling the Azure connection.

The config object is quite big, to properly validate changes according to the scheme as exposed by the DUCO box, I have created a recursive validation function, as this is substantially more compact as compared to other solutions.

Please note the validation function also handles "Options" validation with square brackets [ ], as present in the following part of the response:

{
    'Ventilation': {
        'Calibration': {
            'PwmEhaCfg': {'Val': 62, 'Min': 0, 'Inc': 1, 'Max': 100},
            'EnableAutoCalib': {'Val': 0, 'Min': 0, 'Inc': 1, 'Max': 1},
            'CalibOnMan2': {'Val': 0, 'Min': 0, 'Inc': 1, 'Max': 1},
            'GroundBound': {'Val': 1, 'Min': 0, 'Inc': 1, 'Max': 1},
            'HeadCount': {'Val': 4, 'Options': [1, 2, 4]},
            'PwmInverted': {'Val': 0, 'Min': 0, 'Inc': 1, 'Max': 1}
        }
    }
}