Add a device::handle() function to k4a.hpp (#749)
Add a device::handle() function to k4a.hpp (#749)

* Add a capture::handle() function

* Updated Function Comment

microsoft/Azure-Kinect-Sensor-SDK,microsoft/Azure-Kinect-Sensor-SDK,microsoft/Azure-Kinect-Sensor-SDK,microsoft/Azure-Kinect-Sensor-SDK,microsoft/Azure-Kinect-Sensor-SDK,microsoft/Azure-Kinect-Sensor-SDK