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-* Create trait library.
-We'll need traits for both the USB host driver and USB
-device/interface drivers.
-
-Right now everything's pretty tied together with no clean separation,
-but aside from a couple painful points it shouldn't be *too* hard to
-separate.
-
-So far we've managed to avoid needing an allocator, but that's
-probably gonig to be impossible in the general sense. However, it may
-be possible to limit allocation to just the device driver level, which
-is more pleasing since it's more fungible.
-
-* Use trait library for SAMD21/51 host implementation.
-Add features for max devices/endpoints to save on memory.
-
-* Use trait library for boot protocol keyboard driver.
-This code currently lives in `device.rs` and is also a disaster.
-** Parse configuration descriptors.
-
-
-* control/in/out_transfer probably shouldn't take a `&mut T`.
-This is pretty unsafe for functions that shouldn't be unsafe. Instead
-we should take a `&mut [u8]` and let callers be unsafe if they want
-0-copy. This would also allow us to more easily use variable-length
-responses in the few cases those are used.
-
-* Use channel for interrupt -> task messages.
-Currently we use a static mut which holds the latest event. This was
-done for expediency to try and get somethnig working and this was
-working in Arduino. It's also massively wrong in the general case and
-overflowing with race conditions.
-
-A channel will allow us to deterministically walk events and make sure
-everything's ordered properly.
-
-* Use endpoint packet size on pipe.
-The pipe is just using a max packet size of 8 bytes, regardless of
-what's on the endpoint. pcksize will need a function to take
-max_packet_size and convert it to the variant that is closest without
-going over.
-
-* Clean up pipe descriptor stuff.
-There's a bunch of unsafe functions that can be made safe.
-
-* Some SVD patches needed for SAMD21/51.
-There's a lot of `unsafe` code where there shouldn't be, because the
-SVD files are lacking.
-
-* Stop passing millis function around.
-This is horrible, but currently necessary because there are places
-where we need to loop on a timer at it needs to be
-hardware-independent.
-
-If the USB host library can be made asynchronouse, we could instead
-pass a current timestamp around and use that for delays where
-necessary.
-
-As a last resort, there's a countdown timer trait in embedded-hal that
-may be useful.
-
-* Tighten up timings on requests.
-There are a few timer checks on USB requests, but not necessarily of
-the right duration nor subdivided correctly. For instance, the
-setup-with-data cycle has requirements on total duration as well as
-per-packet duration, but currently we're only using the total.