[gcs] [ground_segment] [speech] added speech_name feature so the audible alerts on the GCS can use an alternate name other than the aircraft name, defined as another field in the conf.xml aircraft entries, no entry falls back to using aircraft name. Note that still not complete, need to fix handling in paparazzi center as right now it deletes the field out of the xml file
[gcs] [ground_segment] [speech] speech_name feature now uses GCS section with SPEECH_NAME defined in the airframe xml file instead of the conf xml file. Reduces impact on ground segment (no paparazzi center mods required).
Merge pull request #340 from scdwyer/speech_ac_name

New feature: speech_name for audible alerts

Adding some doc to the wiki for this would be a good idea