* If new Survey is set to altitude fixed value then use mission default
altitude
* If the user applies a new altitude to the entire mission change
surveys to fixed altitude and apply altitude

Caused intersection failure in some cases

Instead of hardcoded "QGroundContorl" strings

This makes VehicleComponents reusable from core plugin without
requiring override of prerequisiteSetup

Also added ui support for multiple complex item types

- Shot Interval in Survey
- Much change to time/distance calc