- Add recursive_mutex
- Make all locking primitives and sleep use common overridable wait/notify support to allow RTOS
implementations to replace WFE/SEV with something more appropriate
- Add busy_wait_ms
This directory code that is common to all builds regardless of PICO_PLATFORM. It is a mix
of common header files, or high level functionality built entirely using hardware_ or pico_ libraries provided
by the actual target `PICO_PLATFORM``