Refactor DeviceInfo to use an interface

[mattleibow]

Description of Change

Use a lazy interface.

Required for #1965

Additions made

public interface IDeviceInfo
{
	string Model { get; }
	string Manufacturer { get; }
	string Name { get; }
	string VersionString { get; }
	Version Version { get; }
	DevicePlatform Platform { get; }
	DeviceIdiom Idiom { get; }
	DeviceType DeviceType { get; }
}

[PureWeen]

Can we rename the files to match the classes?

[PureWeen]

Looks good!

Does it make sense to rename the files to match the classes?