Fix overall Palette Window UI

Export color palette in formats that can be directly used by QGC and custom plugins (in addition to the original Json)
Tweak palette export UI

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Adjust colors
Remove unused image

Changed (selected) mission item color to primaryButton instead of buttonHighlight
Adjusted some colors for better contrast
Removed a few JavaScript exceptions caused by the order of object destruction

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Plus lots of other tweaks to ui for visuals

Passing parameters QVariantMap across C++ boundary was causing crashes
in Qt due to Qml array bugs. Referencing same Fact* across Qml boundary
in multiple QQuickWidgets caused jScript GC to crash.

Controls respect QGCPalette settings. Also added test window.