map viewer/places examples: Brush up the code

- Use modern string literals
- Use the variadic template version of QMetaObject::invokeMethod()
- Use modern connect syntax
- Reorder includes
- Trim newlines in QML

Fix minor bugs:
- Skip empty elements of library path (namely when variable is not
  set)
- Fix the check for osm.useragent to operate on the map
- Exit cleanly on QML loading errors

Since places uses similar code, apply the changes there as well.

Pick-to: 6.5 6.5.0
Change-Id: Ibaeffc6e003c55c458137458c5017584e0c072f1
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 0 insertions, 1 deletions

diff --git a/examples/location/mapviewer/forms/RouteCoordinate.qml b/examples/location/mapviewer/forms/RouteCoordinate.qml
index ca289e93..f2eb771f 100644
--- a/examples/location/mapviewer/forms/RouteCoordinate.qml
+++ b/examples/location/mapviewer/forms/RouteCoordinate.qml
@@ -39,4 +39,3 @@ RouteCoordinateForm {
         toLongitude.text = "" + toCoordinate.longitude
     }
 }
-