* 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