- Introduced a new RTSP relay server that allows WHIP streams to be served over RTSP.
- Added `RTSPRelayAddr` configuration option to enable the RTSP relay.
- Implemented methods for updating codec parameters and forwarding RTP packets to RTSP clients.
- Enhanced the WHIP server to handle RTSP connections and manage multiple clients.
- Added comprehensive tests for RTSP relay functionality, including OPTIONS, DESCRIBE, SETUP, PLAY, and TEARDOWN requests.
1. Allow variables in placeholders for parameter values, e.g.
{rtmp,name=$processid}. The variable starts with a $ letter.
The recognized variables are provided with the Replace func.
2. The template func recieves the process config and the name of
the section where this placeholder is located, i.e. "global",
"input", or "output".
