yi-hack-MStar 0.3.7

Thanks to @foxel for his contribution.

Update submodule mqttv4
Kill mqttv4 to force disconnection on reboot (#240)
Add wsdd to service.sh and minor fixes
Add option to create directory tree in ftp upload
Add WiFi Strength to status page
Add httpd ranges to httpd
Update onvif_srvd to last version
Add mqtt camera to configuration web page