Clean up references to MainRootWindow globals

Switch to Controls 2 version of QGCButton

Set RC To Param support

Allow reset all to default for any firmware

SectionHeader no longer set width automatically

Fix display of param load errors

bug in ParameterEditor removed, double-ckicking on a group button shrank width of rectangle and thus of mouse area to 10

Update all files that use a QML Menu item to QtQuick.Controls 2.4 to solve the issue of a menu showing up in random places on Android.

Fixed flight widget position.

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

Duplication cleanup

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Shows horizontal/vertical scroll indicators

Rewrote editor to be performant enough to support typedown

Android done.

UI Tweaks for all mobile platforms.