* Don't inherit Device and Interface from pipes anymore. The device has a default pipe member now.
* Since the parent of each Object is now known, we can send control messages using the default pipe of the device from all attached elements (pipes and interfaces).
* Fixed the generic {Set|Clear}Feature() and GetStatus() calls to include the endpoint address for pipe specific requests.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18710 a95241bf-73f2-0310-859d-f6bbb57e9c96