* try http-flv first for reolink cameras above 5MP in the camera wizard
The wizard picked RTSP for every Reolink above 5MP and then warned that RTSP isn't recommended, telling users to enable HTTP and restart, which just produced the same result. It now tries the http-flv stream first for those cameras and falls back to RTSP when the stream doesn't probe, since only the newer models serve H.265 over enhanced FLV. The RTSP warning is skipped when the camera's resolution made RTSP a valid choice.
http-flv no longer needs go2rtc's ffmpeg module, so the compatibility mode warning for Reolink HTTP streams is removed and the docs drop the `ffmpeg:` prefix from http-flv sources that have no transcoding modifiers.
* add reolink tests
* keep using ffmpeg module
