[rotorcraft] get rid of some warnings in ardrone2_sdk
[gen_fligtplan] 'call' statement can be configured to loop and/or break

default behavior:
- the function is called until returning FALSE (same as before)
- at the end of the call, go to next stage immediately (new)

this is related to #830
[replay] filter messages to remove warnings during replay

close #894
[GCS] reword maps fill mouse over

see #903
[ext][stm32] update libopencm3

to get updates from libopencm3 and remove our own workarounds for:
- STM32F4 25Mhz clock: https://github.com/libopencm3/libopencm3/pull/311
- STM32 defines for TIM9-TIM17: https://github.com/libopencm3/libopencm3/pull/350
- STM32 set I2C address: https://github.com/libopencm3/libopencm3/pull/344

additionally get fixes:
- STM32 safe gpio toggle: https://github.com/libopencm3/libopencm3/pull/337
[conf.xml] update to new settings_modules
Merge pull request #932 from paparazzi/update_locm3

[ext][stm32] update libopencm3
[ocaml][messages] use quotes for char arrays

- char[] are now treated as 'real' strings
- no more delimiters for other arrays (where space characters should not
  appear)
- INFO_MSG are printed in the GCS console