Clean up references to MainRootWindow globals

Add separate Gyro cal support

Add support for compass priority

Visual accel cal

Fixed flight widget position.

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

Support COMPASS_AUTO_ROT==2 for orientations set automatically.

Fix Reboot and Waiting for Cancel

Also added new FirmwarePlugin::brandImage support

width/height must be specified by user name

Android done.

Change all text to have a qsTr call, this way it will
call the right translated text when needed.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

- Sensors summary now shows you how man compasses you have
- Fix for APM accel cal. Can only use first accel offsets.

Add scroll height indicators to Flickable