C++2003 didn't had variadic templates so different number of
arguments must have been already implemented in the templates
and since it's impossible to get the amount ot different methods
that paople write, a variadic template was neede.

now we can connect signal / slots with 6+ arguments.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Hard to believe you could screw up something so easy!

There are many ways of iterating over lists in C++/Qt.
In the specific case of QStrings, it is known [1] that using
foreach with const references avoids the creation of new
QString objects in each iteration, reducing the time consumed
by the loops.

[1] https://blog.qt.io/blog/2009/01/23/iterating-efficiently/Signed-off-by: Anselmo L. S. Melo <anselmo.melo@intel.com>

Plus notify user

Instead us a Toolbox concept which hangs off of QGCApplication

- Also added new adjustMavlinkMessage support

- MultiVehicleManager is a Qml friendly replacement for UASManager
- Vehicle is a replacement for both UAS and AutoPilotPlugin

Also fixed case where UASMessageHandler reported errors but walking
list turned up no errors

Was causing unnecessary read re-requests to get sent out