Clean up references to MainRootWindow globals

Sizing fix

Fixed flight widget position.

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

Clean up wasted space

Fix Rover check for isFlying

Hack to allow Rover setup pages to work

This will make setup pages respond accordingly to armed state
transitions. This will also allow the settings on a page to at least be
visible while they are disabled.