Component Information FTP download support

LinkInterface and Vehicle uses mutexes to synchronize writing bytes to the link instead of queued signals

Also fixed custom build

App messages now use simple modal message dialogs. Vehicle messages continue to use non-modal popup.

Set RC To Param support

Remove unused HIL code

Remove unused code

Better flight trajectory point algorithm

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.

Map gimbal controls
Keep track of gimbal position within Vehicle

Add gimbal to external control signal

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Remove unnecessary AudioOutput dependencies.

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Move ArduPilot preflight check handling to generic QGC

http://www.wolframalpha.com/input/?i=!s+%7C%7C+(s+%26%26+a)Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

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

If there are dropped packets during a burst download, the offsets and sizes
of the missing chunks are stored in a queue, and after the burst is
completed, they're requested individually.

This stores the last request and resends it after a timeout, with a max
of 6 retries.
It also checks for old incoming packets and drops them.