Support audio playing (AT3, AT3+, Mp3, AAC)
Update MediaEngine.cpp

fix new feature in MediaEngine.cpp
Update MediaEngine.cpp

Support both old and new savestate for mediaengin.cpp
Update MediaEngine.cpp

auto s = p.Section("MediaEngine", 1, 3);

if (s >= 3){
		p.Do(m_audioType);
	}
	else{
		m_audioType = PSP_CODEC_AT3PLUS;
	}
Merge remote-tracking branch 'origin/master' into Support_Audios
Add DoState for sceAudiocodec
Bugfix in x64 emitter, thanks magumagu
Merge branch 'Support_Audios' of github.com:kaienfr/ppsspp_cn into kaienfr-Support_Audios
Clean up some details in sceAudioCodec.