dring: expose MediaFrame, support Android' Camera2 API

bin/jni/videomanager.i

src/client/videomanager.cpp

src/dring/videomanager_interface.h

src/media/media_buffer.cpp

src/media/media_buffer.h

src/media/media_decoder.h

src/media/media_stream.h

src/media/video/video_base.cpp

src/media/video/video_base.h