Work on Video Streaming (mostly related to recording it)

Adding mux GStreamer plugin libraries to Android (to enable video recording on Android)
Adding an option to limit the amount to disk used for saving videos
Adding an option to show/hide the REC button (allowing plugins to handle the recording in their own way)
Adding simple frame grab to file

Better/More survey related unit testing

Bump ArduPilot min versions

Fixes

Remove incomplete Mixers page

The ardupilot parameter meta data generator will generate dups when the
parameter is in ifdef'ed code

Bugfix for factcomboboxes on Sub safety page

Add frame parameter defaults option for Sub

Plan fixes

Mission Settings: Fix section dirty bit handling

* Add resource config for vmware

* Ignore vagrant directory

* Vagrant config use Qt 5.7

* Vagrant support docker provisioner and use Ubuntu 16.04

* Fix paths for Vagrant build

* Update Vagrantfile to match Travis

* Prefer VM providers over docker

* Get apt packages and environment from travis.yml

* Add graphical environment to Vagrantfile

* Use full Qt 5.7.1 download

Home position update fixes

Change target definitions order

Fix crash in refly recalc

Adjusting QGC location icon.

Keep track of firmware type during flash/connect

Use image for GCS location on map