Build better device.uuid for Windows 8.1 /10

Currently the device uuid is read from Windows.System.Profile.HardwareIdentification.getPackageSpecificToken(null).id

This value depends on the hardware configuration of the device. It will e.g. change even if a USB drive gets (dis)connected.

To provide a more stable device uuid you coud use the following snippet. The value would then depend on device and user and would even 'survive' an app uninstall.

var easClientDeviceInformation = new Windows.Security.ExchangeActiveSyncProvisioning.EasClientDeviceInformation();
var deviceUUID = easClientDeviceInformation.id;

see https://docs.microsoft.com/en-us/uwp/api/Windows.Security.ExchangeActiveSyncProvisioning.EasClientDeviceInformation#Windows_Security_ExchangeActiveSyncProvisioning_EasClientDeviceInformation_Id