AudioOuput class restructuring

Add cameras

Fix bad meta data

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

Update TCPLink.cc

LogDownloadController: start the timeout timer when requesting the first chunk

Add option to disable video auto-delete

Add safety page for ardurover

String fixups for localization

ArduPilot plugins: final -> override to allow custom builds to use as base class

Allow version numbers greater than 9

Stable merge

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

Fix Resume Mission race condition

Can't change save path on mobile

Structure scan: Support for scan distance from structure polygon

Fix crash when adding second structure scan

fix issue #2971

APMParameterFactMetaData.Plane.3.8.xml: Add missing SERVON_FUNCTION values

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

Properly handle camera info request and response.

It's not just iOS that excludes serial link.

Revert "Fix current mission item updates"

Fix TCP disconnection problem.