yi-hack-MStar 0.3.5

Due to a breaking change, reconfigure rtsp audio option and save.
Remember to clean the cache of your browser.

Thanks to @Catfriend1, @PieVo and @Schm1tz1 for their contributions.

Add wsdd submodule for onvif auto-discovery
Add additional options to onvif (manufacturer, model, hardware, firmware, device id...)
Add href to rtsp links on status page
Update mqttv4 with new retain options
Add ftp export of video files (thanks to @Catfriend1)
Minor improvements to h264grabber
Audio replicator with noise reduction 16khz (#203) (thanks to @PieVo)
Add noise reduction level to configuration
Moved mkfifo to busybox
Add option to write to fifo in h264grabber
Add change root password feature (thanks to @Schm1tz1)
Add CONTRIBUTING.md
Reduce select width in css
Add audio only link to status page
Update README.md