Remove leftover

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Store stats about RTP within gen_rtp_channel

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Don't use proplists for stats reply

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Add possibility to specify different subscribers for RTP and RTCP

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>