Also additional major Mission usability changes

Removed commented v4 ArduPilot Quad fw links

To address issue https://github.com/mavlink/qgroundcontrol/issues/2735

This was causing problems with auto-connect after a flash

This provides a better workflow for firmware upgrade

- Also fix vehicle selector dropdown in toolbar

Add scroll height indicators to Flickable

The lines removed set the center point of the throttle axis to one extreme of the joystick range. This causes an offset value when the stick is centered if the joystick does not return exactly zero. This is important for vehicles with reversible throttle, such as ground robots or boats.

Verify was failing due to incorrect READ_MULTI max size

This reverts commit bf31c808.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Takes less real estate and flows better and small displays

Even though it’s wrong!

Direct connect to PX4 Flow shows up as generic