implement range calculation

[todo]

NotificationService/controllers/mail.js

Lines 49 to 54 in d400f29

	range_value: 0, // TODO: implement range calculation
	range_unit: dataObj.settings.range_unit,
	consumption_value: dataObj.settings.consumption,
	consumption_unit: dataObj.settings.consumption_unit,
	consumption_text: (dataObj.settings.consumption_unit === 'km' ? '/100' : '/') + dataObj.settings.range_unit
	};

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This issue was generated by todo based on a TODO comment in d400f29. It's been assigned to @GPlay97 because they committed the code.