- 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

to the clearer, standard versions of the AWS links.

Also updated parser for new xml format

Switch QGC firmware upgrader for PX4 to AWS and Travis. Use beta/stable/master for Firmware, map all three items to master for Flow (because there are not beta/stable branches)

- Much simpler UI
- MVC style qml programming model