Port of GPS modifications from SVN
Fix problem with GPS speed unit used with voice
Compilation error
Speed unit in logs depending on imperial parameter
Merge branch 'next' of https://github.com/opentx/opentx into bsongis/Issue524_SPORT_GPS

Conflicts:
	radio/src/translations.h
Merge branch 'next' of https://github.com/opentx/opentx into bsongis/Issue524_SPORT_GPS
Units in all languages
Conversion of °C->°F on HDG
Altitude stored as feet in logs when imperial mode chosen
Merge remote-tracking branch 'origin/next' into
bsongis/Issue524_SPORT_GPS

Conflicts:
	radio/src/telemetry/frsky_sport.cpp
	radio/src/translations/de.h.txt
Compilation error
Merge pull request #755 from opentx/bsongis/Issue524_SPORT_GPS

Bsongis/issue524 sport gps