Use USART3 to record the gps data
Initial commit if serial_dump
this python script can help user to dump data to MCU with serial port
Let serial_dump has command options
Merge branch 'usart3_record' into tool_dev
Change command option, need to specify file name now
Add ublox lea 6h raw gps data
Merge branch 'tool_dev' into navigation_dev
Revert "Use USART3 to record the gps data"

This reverts commit fa911a62358a8d9315f6c588679988c70b369794.
Merge branch 'os_dev' into navigation_dev
Test waypoint in navigation task
Assign wrong value to navigation_info.current_pos
Merge branch 'os_dev' into navigation_dev
Merge branch 'os_dev' into navigation_dev
Broadcast the "target" waypoint number
Add WAYPOINT_DEBUG to display some messages
Create structure "current_waypoint" and "reached_waypoint" into waypoint manager
Send the current waypoint and reached waypoint through the ground_station_task
create function "set_reached_waypoint_number" and "set_current_waypoint_number"
Merge branch 'os_dev' into navigation_dev
After "done", quadrotor should go next waypoint or hold here