yi-hack-Allwinner 0.1.5

Fix redirect on main web page after reboot
Add baby crying detect support
Add audio support to RTSP server (many thanks to @PieVo for adding it in MStar project)
Update mqttv4 to the latest commit
Fix bug in env.sh
Add support for baby crying detect
Change format of post message in set_configs.sh
Add page with list of timezones
Add NTP server setting in configuration page
Fix button text when save camera settings
Add feature to remove all mp4 folders (only web service)
Change camera_settings.sh to save settings on file