This MR adds a basic implementation for the BluetoothAdapter interface in Windows.Devices.Bluetooth, including winebth.sys support for getting properties associated with the radio's Low Energy capabilities.
-- v4: windows.devices.bluetooth: Implement BluetoothAdapter::get_BluetoothAddress. windows.devices.bluetooth: Implement IBluetoothAdapterStatics::GetDefaultAsync(). windows.devices.bluetooth/tests: Add tests for IBluetoothAdapter.