[interfacekit] BLooper extensions

I am not too fond towards that extension to BLooper. It's only very 
rarely needed to do something like this in real life, so it's not 
urgently needed right now. We own BLooper and BWindow, so we can just 
implement task=5Flooper() two times, I wouldn't have any problems with 
that.
For the future, when we have something like the now often mentioned 
wait=5Ffor=5Fmultiple=5Fobjects(), I would prefer something like:
BLooper::AddPort(port id);

along with an extended form of BLooper::GetMessageFromPort() which 
specifies the port number or something like this.

BTW the original BWindow *does* overload BLooper::task=5Flooper() so I 
think binary compatibility might require us to do that, too (windows 
that inherit from BWindow rely on it).

Adios...
   Axel.

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