Also fixed bug with ArduPilot guided waypoint write which would trash
existing mission.

Handle survey mode state

Also hand carried text to speech changes from Stable to master. Plus
unit tests for that.

Need to hand carry some stuff from Stable to master in order to fix

Fix crash when adding second structure scan

Signed-off-by: Willian Galvani <williangalvani@gmail.com>

Fix TCP disconnection problem.

The timer was only started in _logData(), which was called after receiving
the first chunk of data (and only if that was successful), which means
if the first request failed or timed out, the UI would never switch to
a timed out state.