[made library output more informative]
'advanced-logging' -> features/adaptive-rate-control
[untracked] fixed logging, data rate meter and frequency meter
[untracked] multiple bitrate-consumer
[untracked] integrated ARC
Merge commit 'a7ea8ec: multiple bitrate-consumer' -> 'dev'
implemented separate rate control component which handles ARC
'features/adaptive-rate-control' -> 'dev'

Conflicts:
	cpp/src/playout.cpp
removed ARC for this branch
fixed playout mechanism bug
fixed key frames counter bug
implemented publisher side session info

- producer replies with session info structure to the interests issued
in session info namespace. session info contains all the encoder
parameters for all the streams that producer currently publishes.
producer updates this data every second. consumer should request this
data before starting fetching data from producer.
implemented fetching session info on consumer side