Adds a Recorder implementation for which attaches to an RTP translator and records all (recognized) incoming streams.

Fix a failure to set the SSRCFactory when an RTPTranslator is used, resulting in the SSRC of a video MediaStream changing when the stream starts. Reported by Thomas Kuntz.

Introduces a flag that disables SRTP extensions in DtlsControl so that it can be reused in non RTP streams.

Adds method for sending data over DTLS layer to the transformer. Returns application data packets from transform method.