[interfacekit] Clipboard watching

Hi,

I just checked in my roster watching code. I removed the private 
BRoster::_{Start,Stop}Watching() methods. They aren't used by BMimeType 
nor by BRoster, and thus I thought, I get rid of them and of a couple 
of friendships. BClipboard::{Start,Stop}Watching() should finally look 
similar to the BRoster counterparts.

On the registrar side, I implemented a more or less generic 
WatchingService class which provides a simple mechanism. As the 
clipboard watching doesn't need any event masks or special features, it 
can be used directly without any need for other classes. It's not 
documented yet, but its interface is fairly small, so that should be 
easy to understand. I just wanted to check it in before hitting the 
road towards BeGeistert. :-P

CU, Ingo



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