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

Needed to support different indicators for advanced mode

Moved "Grid Lines" out of General Options and into the Video Stream Widget
Made a QGC custom Switch element

Nope, it's microseconds alright. The autopilot I was testing with indeed only had 19 seconds of "armed" time.

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

Still does not support multi-vehicle

Fix merge issues