3DR Radios no longer exist

Domain changes for the ArduPilot locations from DIYDrones to
ArduPilot.org

I removed some needed headers from a top level file which then causes a
ripple effect downstream

Removed commented v4 ArduPilot Quad fw links

To address issue https://github.com/mavlink/qgroundcontrol/issues/2735

- Also fix vehicle selector dropdown in toolbar

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Even though it’s wrong!

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

- Pervasive change to automatically connect to known board types
- Lots of additional changes along with this:
- More exposure of objects/properties to Qml
- Much restructuring in LinkManager and LinkManager clients

Instead us a Toolbox concept which hangs off of QGCApplication

also moved back to flashing stable firmware for 3dr radio

Also enable identification of clone 3dr radios

Usability plus, new features:
- 3DR Radio support
- APM Stack support