Hack fix for terrain crash when new query comes through before old query is complete

Hide flight speed and camera section for ArduPilot. This is because it doesn't allow mission items to be before the TAKEOFF command.

Don't add takeoff as first item when it doesn't make sense for vehicle

Change Command only supported for Simple Items

Prompt for Reboot after compass cal

Respect app units

Use NaN to signal lower level error

Kick off terrain query after load

Don't query intermediate state

Better logging

Add new Help page under Settings

Persist tile info as doubles. This prevent float/double precision match errors at the edge of tiles.

Bump terrain tile version due to format change

Turn internal errors (elevation == -1) into failed query to prevent bogus elevation from reaching upper layers.

Fix failure handling

Use qCWarning for internal errors

Save camera settings

Wrap text

Remove WIP

Fix editor sizing

Work around android Qt bug where wrong virtual keyboard is displayed

Fix negative wind direction

Fix initial value calculations

Add flickable

Add file extension if needed

Duplication cleanup

Add Sentera cameras

Fix Reboot and Waiting for Cancel

Better speech for PreArm

This is in addition to the existing text edit control.

Fixed issue where the "Set Circle Radius" menu entry was trying to affect the visibility of an item within a component.

This way you can click anywhere