This makes VehicleComponents reusable from core plugin without
requiring override of prerequisiteSetup

Also added new FirmwarePlugin::brandImage support

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>

Starting point for real implementation

- properties now hand off of main “autopilot” object in qml
- Added support for summary items through qml