yi-hack-MStar 0.3.9

Add file delete to ftppush
Add support for y30 model
Add web service to start/stop recording
Fix empty folder delete in ftppush
Fix reboot command when rmm crashes
Update onvif_srvd to the last version (improve dvr ompatibility)
Corrections of absolute url paths (thanks to @cnico)
Add jq
Move variable files to /home partition
Add crontab configuration feature