This mechanism automatically queues data into the correct thread where necessary, otherwise the method is invoked directly with low overhead.

At the same time remove the UDP socket event workaround. It is not a problem.

This way we don't need macro-magic to deal with
different operating systems and compilers.

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

3DR Radios no longer exist

Plus other auto connect bug fixes

Plumb through initial object mode on Vehicle

Was failing on slower ArduPilot boots. Also could fail on PX4 boots
which required px4io flash on boot.

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

- Also fix vehicle selector dropdown in toolbar