Added SetupDiOpenDevRegKey(..), SetupDiEnumDeviceInfo(..) and some constants

I added the following items to the Win32 SetupApi
* SetupDiOpenDevRegKey(..) 
* SetupDiEnumDeviceInfo(..) 
* some constants associated with SetupDiOpenDevRegKey(..)
* Tests both methods

The JavaDocs are copied from MSDN, is this a legal problem?

Make this look like all the other changelog items.

* Period at the end.
* No `(..)`.
* Write the full class name where this is added, JNA is not just Win32.