yi-hack-MStar 0.4.5

Fix error about db and add new parameter to speak*.sh
Improve privacy.sh to handle rtsp_server_yi
Minor fixes about rtsp server launch
Add minimp4 application
Fix bug packing firmware
Restore human_detection code in mqttv4
Decrease footprint with gcc options
Fix authentication in rRTSPServer.cpp
Update rtsp_server_yi to the last release
Add image grabbing from mp4 files
Add thumbnails creation for mp4 files
Remove useless files
Improve configure_wifi.sh script