Mavlink terrain protocol support

Plan: Make PX4 VTOL takeoff work like fixed wing

Update vehicle heading from possible item change

When a child item is current show the parent as selected

Support for new TakeoffMissionItem and Takeoff Tool 

Wizard Mode for Create Plan

New Create Plan support

Fixed found bugs

Also work on plan toolbar readability

Also added ui support for multiple complex item types

first iteration of mission stats calculation (dist and maxTelem)

add survey item distance to mission distance

remove unused calculations from _calcHomeDist

added correct calculation of missionMaxTelemetry when there is a complex item

use speed to compute mission time according to vehicle type

started implementation of hover and cruise distance

corrected typos

added logic

prevent survey from crasing

added checks for vtol

rearrange logic

added primitive check for landing

rearranged checks

new arrangement

added logic for transition

fix for small bugs

add check for mission speed larger than 0

remove already existinh check

reduce code a bit

clean up