Add Xcode 8 warning

Mission command tree respects FirmwarePlugin::supportedMissionCommands

GeoFence: Breach validate

GeoFence: More work on load/save send/receive semantics

Survey: Added EOSM camera.

File load/save for GeoFence

(the name was already the longes one)

Video updates for Ubuntu.

Offline vehicle support

Includes ability to load params

This prevents problems with toolbox references from inside
QGCTool::setToolbox calls.

-GIT_TAG is redundant
-closes #4023

-we need a monotonically increasing integer for android versionCode and
this works better across multiple branches

Cancel polygon edit in appropriate places

Fix dialog buttons stuck in disabled state

Allow GenFenceManager to specify QML for fence editor

Remove unused code

Update README.md [ci skip]

PX4 fence plugin

Add altitde to survey item coordinate