add sdp helper to find direction. add crlf in splitSections for consistency
add sdp helper to find direction. add crlf in splitSections for consistency

Acidburn0zzz/adapter,jan-ivar/adapter,webrtc/adapter,jan-ivar/adapter,xdumaine/adapter,xdumaine/adapter,Acidburn0zzz/adapter,Acidburn0zzz/adapter,webrtc/adapter