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>

First commit of modernizarion of Qt signal connections,
the new signal connection is very userfull because of a few
nice things:

- it's checked at compile time instead of runtime
- it can connect to any function or method, so we don't need
to use slots anymore
- it's way faster because it doesn't need to work with string
comparisson, but it's basically a direct call.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

linux include required libraries

PX4 Firmware no longer requires mavlink USB start

QGCView::showDialog std size

Parameter editor work

Colors

Simplifying Airframe config

Fixing crash bug.

Add comment about not using zip file for downloading

Users are getting confused because we are missing images. Will put back
new fancy version once we get new airframe config plus auto-generate of
images sorted out.

Add MNT_DEFLT_MODE combo

Arming checks added to Safety

Focus is still not working correctly

Mission Edit: Rework gear icon to hamburger with menu options

Causes UI to hang up

Hamburger: Delete, Delete All, Show all Values

Using HDOP for GPS signal strength indicator.

appveyor fix nsis install