Better handling of vendor and product ids

Serial link runs on main thread

Esc cal: Yellow text for prop warnings

This is needed for Android since it needs to communicate with java apis
which require everything on the main thread. The additional thread was
not really needed since you can implement using a signal based approach
which ends up being the same thing.

Parameter validation

Major re-write of Firmware Upgrade

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

Moving to Dev 2.6

Switch to 2.5.2

Automatic UDP Link Configuration

Fixing Qt event loop issue where UDP readReady signal would not work.

Switch to Stable 2.5.1

Change mag cal to 6 orientations

Small build fix for mobile (Android and iOS).

Force Default Group to top of parameter editor list

Send MAVLink message for all joystick modes

Moving image resources to their own QRC path.

Update firmware upgrade controller links for AeroCore firmware