Features and bugs fixing

Bugs fixing

• Fix the station mode not starting as expected
• Fix the message when station mode starts a.k.a the icon on the screen fix and not blinking indefinitely)
• Fix the station mode when the expected AP do not exist by addind a timeout and FAKE AP name in the wifi menu
• Fix USB console script to be able to connect to a serial line over USB (need a way to launch the script)
• Fix some Wifi starts behavior and change the way wifi.conf file is taken into account
• Add a conversion of EOL from Windows to Linux for wifi.conf file to avoid bad line ending

Features added

• Add an event manager to react to events from the Yi (work only with Wifi or ethernet on)
• Add a script to launch a script called bootcmd.sh at boot, only for Linux commands (different from autoexec.ash)
• Add static IP address for station mode cause some people need it (Thanks to @lucky lin)
• Add persistant wifi.conf file in the firmware to avoid lost of the SDCard or bad SDCard (Thanks to @lucky lin)
• Add ethernet over USB driver to replace/complete wifi connection (start with wifi script)

Others related to the firmware

• RTMP bitrate modification
• RTMP resolution modification