Heavily rework msiounit.m to make simpler and fix terrible bugs resulting in audio heavily distorded because advertised sampling frequency and real sampling frequency were mismatched.

Do not convert IPv4 address to v4-mapped one if socket is not bound on IPv6 address in TURN endpoint.

Bring several fixes around MediaCodecDecoder.

MediaCodecDecoder: restart the decoding session should AMediaCodec_dequeueOutputBuffer() return AMEDIA_ERROR_UNKNOWN.

This status code means that the underlaying Java object has thrown an exception. The decoding session
is often invalid in this situation and needs to be restarted.

Handle the case when AMediaCodec_dequeueOutputBuffer() returns AMEDIACODEC_INFO_OUTPUT_FORMAT_CHANGED and AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED consecutively.

Before that fix, the second call to AMediaCodec_dequeueOutputBuffer() was considered as failed
although AMEDIACODEC_INFO_OUTPUT_BUFFERS_CHANGED was returned.

Build a single mediastreamer library (instead of mediastreamer_base and mediastreamer_voip) and a single mediastreamer2 framework for iOS.

fix(videostream): do not use const MSVideoConfiguration** as ms_filter_call_method parameter (invalid cast)

fix(mediastream): fix ms_media_resource_get_soundcard macro, use soundcard instead of invalid souncard field

Encoding bit rate was set to 0 kbit/s should the call hadn't AVPF enabled and the video size was QCIF.