Dthread: add dthread and define USE_VALGIND to make valgrind shutup

Signed-off-by: swpd <swpdtz@gmail.com>
Dthread: add implementaion

Signed-off-by: swpd <swpdtz@gmail.com>
Dthread: add thread specific dthread scheduler

Signed-off-by: swpd <swpdtz@gmail.com>
Dthread: update duda api

Signed-off-by: swpd <swpdtz@gmail.com>
Merge pull request #16 from swpd/dthread

Dthread Support for Duda I/O