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

This was causing problems with auto-connect after a flash

- Fix: Version error message not being displayed
- Correct handling of APM and PX4 files with respect to home position
in first slot
- Emit newItemsFromVehicle signal so editor can fit map viewport on
load from vehicle

This provides a better workflow for firmware upgrade

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

- Also fix vehicle selector dropdown in toolbar

I know that some people belive that goto's are devil's work
but sometimes (like chaining if/elses for failures) it can
actually simplify the code for a better readability and
improved speed.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Strings can be expensive to create, all the issues with allocation,
copy of the char members, conversion to UTF-16. QStringLiteral creates
one in compile time.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

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

virtual marks a method for inclusion on a v-table, but we don't want
the methods of classes that won't be inheritable to have a v-table,
we want, however, to issue a warning if somebody try to inherit
that specific class and reimplement those methods.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Uploaded new .svg icons referring to Airframe Configuration screen.
Deleted .png files.
Signed-off-by: Carlos Felipe <carlos.felipe@intel.com>

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

- Positions are bounded to rectangle
- No longer re-centers if thumbs go outside bounds
- ThumbPad moves to meet first thumb position, this prevents
inadvertent movement as you put your thumb down

Add scroll height indicators to Flickable

Since parameter system will pop message based on meta data

The lines removed set the center point of the throttle axis to one extreme of the joystick range. This causes an offset value when the stick is centered if the joystick does not return exactly zero. This is important for vehicles with reversible throttle, such as ground robots or boats.