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-factorize audio_iterate, video_iterate, media_iterate
-add up/down bw stat to MediaStream
-fix bitrate controller driver for opus
-add Mediastream tester

* workaround hardware bug on Galaxy S3 mini, where audio recorded is bad at 44100 and 32000 Hz.
* allow native sound system to work on Android 4.3 (few API changes)
* move android_echo.* files to a more generic implementation, so that it can be used on other OS as well.

- remove the hardcoded jpeg
- allow to set a NULL image so that nothing is sent.

This reverts commit cc85d206.

uPnP: Add upnp_igd_get_device_name, upnp_igd_get_device_model_name and upnp_igd_get_device_model_number functions

It has to be ignored.

fix recv buff size of RTP packet: should be 1500 at minimum, regardless of configured mtu (ms_get_mtu()).

Add API to get list of video encoder configurations and to set the video encoder configuration to use.