* Trying to send mjpeg via MultiMediaSourceMuxer
* Improved JPEGRtpEncoder::inputFrame code but still not working
* 优化代码
* 完善jpeg相关逻辑
* Micro fix
* FrameJPEG renamed to JPEGFrame according to ZLM style
* Modified JPEGRtpEncoder::inputFrame and JPEGRtpEncoder::rtp_send_jpeg
* getVideoHeight(), getVideoWidth() and getVideoFps() in JPEGTrack
* mjpeg rtp打包避免内存拷贝/修复mjpeg rtp解包huffman_table size字段错误的bug
* 支持mjpeg pix type
* 优化性能
* add bom header
