When you selected via the Menu to go to Fly Mode, the QML
toolbar didn't followed the option, and if you selected
via the menu to go to all the three possible views (setup,
fly and plan) the menu would be all-selected.

This tries to keep consistency of things.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Plus lots of other tweaks to ui for visuals

Mostly accomplished by delay loading Qml elements

Main toolbar: Clearly indicate that we do not have battery indication (and the battery is not just flat at 0.0V

- select active vehicle
- arm/disarm
- select flight mode

- Moved all MavManager functionality to Vehicle
- Updated all code to use Vehicle instead of MavManager
- Removed MavManager

Also restructured some toolbar positioning QML to handle resizing.

Everything is now based off of default font pixel size

Initial rendering of Waypoints

- All resources are either under src or under resources dirs
- Removed files top level directory
- Move flightgear files to top level dir

Use default font wherever possible. Where that doesn’t work, use
ScreenTools::dpiAdjustPointSize.