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interfaces, endpoints and generic descriptors. * Add getter for active interface index and simplify the count operation as it isn't misused to also get interface descriptors anymore. * Refactor out some common code into helper functions. * Adapt the USBKit to the changed/new interface. * Change how alternate interfaces are exposed by USBKit by providing normal BUSBInterface objects for alternate interfaces that can easily be examined and used. * Make BUSBInterface class aware of its alternate index and use the alternate aware usb_raw functionallity to build the endpoint and descriptor lists. * Add ActiveAlternateIndex() to find out what alternate is currently active. * Style cleanup of the USBKit classes, use std::nothrow everywhere and check all allocations. Simplify some code by removing optimization where the benefit is questionable. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27409 a95241bf-73f2-0310-859d-f6bbb57e9c96