RCORE: add AsyncRingBuffer to public API
TESTS: test AsyncRingBuffer
RCORE: Document AsyncRingBuffer
RCORE: add TaskStatus to measure processes, use: testrcore1 --task-status PID
RCORE: TaskStatus: allow pid and thread id specification
Merge branch 'async-ringbuffer'

* async-ringbuffer:
  RCORE: TaskStatus: allow pid and thread id specification
  RCORE: add TaskStatus to measure processes, use: testrcore1 --task-status PID
  RCORE: Document AsyncRingBuffer
  TESTS: test AsyncRingBuffer
  RCORE: add AsyncRingBuffer to public API