* Revert "migrate mbedtls to 3.x (#89)"
This reverts commit f87367211d.
* prevent multiple execution of psync_fs_do_sotp and use atexit in sig hnd
* remove debug.[ch] in favor of plibs debug
* eliminate pcompat
* Decompose namespaces and other cleanup
* add missing unistd.h to psys.c (#113)
* remove useless comment