Only mobile limits line length for fly view trajectory lines

Rally point drag

Mission settings: No max altitude

Fly-Guided: Fixed support for closing all guided dialogs

Flight timer

Also added Vehicle.flightTime to default setup

Fixes

Allow core plugin to disable multi-vehicle support

Plan: Default hover/cruise speed, stop trying to pull from vehicle

Plan: Support load/save/default of NaN for command param

Just use settings defaults

Add support for FMUv4PRO and FMUv5 boards

This adds support for the full-sized FMUv4PRO design and the FMUv5 STM32F7 based generation.

Land abort sliders pop up based on new mavlink landing state

Fixed Wing Landing pattern

Bunch 'o Fixes

Switch MockLink to Mavlink 2.0