A lot of USB structures contain back pointers to their parents,
so we need to be careful about how we copy them around, and update
the back pointers as necessary.
This fixes incorrect assumptions about the layout of descriptors and
gets rid of all the pointer arithmetic.
The USB spec doesn't define a strict order for all descriptors to appear
in.
It just says that endpoint descriptors follow its interface descriptor.
We also have to skip all unknown descriptors (which also can appear
anywhere), not just HID descriptors.
Both the calculation for the interface descriptor address and the
endpoint descriptors addresses (for second interface and above) were
incorrect, and would read the wrong data (and go out-of-bounds as well)
This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow,
UserOrKernelBuffer and ScopedCritical classes being moved to the
Kernel/Library subdirectory.
Also, move the panic and assertions handling code to that directory.
A lot of places were relying on AK/Traits.h to give it strnlen, memcmp,
memcpy and other related declarations.
In the quest to remove inclusion of LibC headers from Kernel files, deal
with all the fallout of this included-everywhere header including less
things.
This name was misleading, as it wasn't really "getting" anything. It has
hence been renamed to `enumerate_interfaces` to reflect what it's
actually doing.
This creates all interfaces when the device is enumerated, with a link
to the configuration that it is a part of. As such, a new class,
`USBInterface` has been introduced to express this state.
