feat: implement clocks enabling

fix: unicode strings

feat: implement cdc application layer, fix enumeration

fix: usb should not rewrite DIEPCTL bits

feat: add rx data callback, increase tx fifo size

fix: make queue thread safe

fix: ensure register access are inline

fix: correctly send functional descriptor

The functional descriptor was not sent correctly,
specifically, it was pointed to its address,
instead of the pointer itself. That meant bunch
of irrelevant stuff was sent instead.

feat: use task_result to indicate blocking

There should be no spin loops inside of the
interrupts, so this change removes them,
and instead uses a result system that has
WOULD_BLOCK result. When this result is returned,
it is expected there was no side-effect and the
function can safely be reran later.

feat: implement enumeration fully

chore: update pin, exti, delay

fix: fifo has to be volatile

docs: add documentation comments to most functions

feat: implement usb devicd cdc descriptors, init, setup

feat: move all sending instructions to generic send functions

fix: make sure to error if endpoint id not found in interrupt

This generally shouldn't happen,
but it needs to be ensured that the
memory at incorrect place won't be read
or written to!
Otherwise there could be undefined behavior!
This would possibly write to the fifos,
meaning the data the usb sends could be
different than what the application intended!

fix: clear bit operation

feat: implement most of enumeration

feat: receive setup packets

feat: implement simple control usb read, writes