[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)
[ocaml] backward compatibility on old array's delimiters
[python] update messages tool to deal with whitespaces in arrays
[filters] add missing include to low_pass_filter.h
[modules] fix some more modules after conversion to telemetry functions
[conf] add aispeed_ms45xx_i2c module to Quad_Navstik

for testing
Merge pull request #942 from paparazzi/ivy_arrays

Remove array delimiters on Ivy messages
[build] quiet output on clean_ac