Fix GStreamer relocation for Mac OS release (installer) builds.

* appveyor install nsis from s3

* Pass YAML linting, pls work

* Simpler nsis download scheme

Fix RTL_LAND_DELAY usage

Fix noisy output

Better messaging for no airframe set

WiFi sensor cal

Mag cal fix

Update PX4 meta data

Show mavlink sequence number packet loss in UI

Turn screen sleep back on correctly

Reenable writing to stderr on *nix platforms for useful debugging

Better command failure output

Plan: Adjust "Change command" for better usability

Parameter save: Notify user on read/write failures after retries

Mag cal: Fix text

* Remove leftover debugging message
* Fix segfault on Linux at close for #3164

Show the user some positive feedback when parameters load from cache.…

Add optional qml-based console to view debugging messages. For #3121

Turn off streamer for OSX

Need to get it into the installer as well first

Guided Bar: AutoHide on short screens only

Swipe View: Use dynamic binding for height