Flight management with date range, delete flights.

Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

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

Some android versions leave a focus arrow indicator turd in the
control. This gets rid of it.

Convert bool settings to SettingsFact

Causing data loss

Doesn’t have a done key which doesn’t work with our user model. May
find a better fix later.

All qsTr calls done
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

All facts are numeric, atm. this means that the input should only
accept numbers. it already had the     inputMethodHints:   Qt.ImhFormattedNumbersOnly
option, but for some reason it still accepted letters and symbols.
by adding a     validator: DoubleValidator {} we limit the characters
to numbers only - and if the value is a integer, it will still work.

Tested by adding waypoints on the map & messing with the GPS coordinates.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Map control use different border color based on map type