Move battery.percentRemainingAnnounce to Qml Global

* Deal with missing parameters on Solo

* Fix trigger set

Temporarily disable MAVLink version check as the QGC settings have no effect and it will mess with the upgrade from v1 to v2 and has no real value

During tests, if the airframe was configured to be an 'X' type
we showed just 'X' on the airframe type. It's correct but a
single letter - specially an X - made users think that it was
a error code, not the airframe name. So, because of that, also
show the vehicle type - a wrong value, but elucidative for users.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

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>