Some boards require an initial gpio state in order to start USB. Port
the initial_pins capability from Klipper to provide that support.
This also synchronizes scripts/buildcommands.py with the latest code
from Klipper.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Add the sched.c code and associated DECL_INIT(), DECL_TASK() macros so
that it is easier to import low-level Klipper code into the CanBoot
repo.
These additional code wrappers do not increase the overall binary size
as gcc does a good job of inlining the wrappers and removing unused
code during the compile process.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
