[supervision] color regex on "error:" and "error "

To avoid false coloring, match only on "error" folowed by colon or space

closes #910
[ground_segment] put google maps dir in Google subdir in var/maps

should close #902
[conf] example on how to use SPEECH_NAME
add *.hgt files in srtm folder to gitignore

closes #900
[simulator] NPS: add --time_factor command line option
[nps] always define USE_MISSION_COMMANDS_IN_NPS if mission_rotorcraft module is loaded
Fix bug in datalink
[modules] add digital_cam_shoot_rc.xml

module to use radio channel as remote camera trigger
closes #937
[messages] add INFO_MSG and print it to GCS console

Uses a separate string_of_chars function for now to convert the
char array from ivy (e.g. |i,n,f,o, ,m,s,g|) to normal string to
nicely write to console and messages app.

Proper solution would be to write char arrays as normal "quoted string" to the ivy bus.
[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)