Porting the NETWM classes to xcb

[Fredrik Höglund]

On Sunday 25 March 2012, Christoph Feck wrote:
> Is it really required to expose xcb headers to applications, that wish 
> to use the netwm header file? If not, please move to netwm_p.h file.

The idea is to eventually replace the Xlib types used in the parameters
to the constructors and methods in these classes with their equivalent
xcb types, and then stop including the Xlib headers.  Unlike the Xlib
headers, the xcb headers don't pollute the global namespace.

But you have a point in that nothing in the public headers depends
on the xcb headers yet, so at the moment there's no need to include
them there.

Fredrik