[dfu] add dfu-util support to flash stm32

display in paparazzi center is still confusing. It seems the verbose
mode is not on stdout and the information status are red (dfuERROR status)
while they are not errors
[fix] c and h files were swapped
make TELEMETRY_FREQUENCY changeable, still defaults to 60Hz
[stm32] specify PPM_IRQ_CCIF for lisa boards

closes #451
[hmc] fix telemetry report for hmc58xx module
[dfu] remove verbose mode (not useful)
[supervision] reload targets when changing airframe

fix #233
[datalink] Fixed a bug in wifi.c

The buffer was not cleared resulting in a constant reparsing of the same message
when no other message was sent to the drone during idling time.
Big thanks to Freek for helping out with this
Enabled usage of magnetometer again and changed back SP_MAX_R to 90 deg/s
added Esky EK2-0905A joystick to play with