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
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