lib: add THREAD_TIMER_MSEC_ON()

 * lib/thread.h: new timer macro, millisecond precision

(this was cherrypicked from pimd to isolate all non-contained changes)

From: Everton Marques <everton.marques@gmail.com>
Signed-off-by: David Lamparter <equinox@diac24.net>
1 file changed