Fix Qt6 deprecated APIs: QCheckBox::checkStateChanged, ExploratoryLocationViewshed

- Replace QCheckBox::stateChanged with checkStateChanged in:
  - lts_dialog.cpp
  - simple_esri_layer.cpp (2 occurrences)
  - layer_control_widget.cpp
  - symbol_dialog.cpp
- Replace LocationViewshed with ExploratoryLocationViewshed (ArcGIS SDK v300):
  - viewshed_analysis.h/.cpp
  - ViewshedLocation.h/.cpp
  - function_dialog.cpp (include)
- Update ViewshedLocation member variable type to ExploratoryLocationViewshed

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/MapImpl/viewshed_analysis.cpp

@@ -16,7 +16,7 @@
 
 #include <AnalysisOverlay.h>
 #include <AnalysisListModel.h>
-#include <LocationViewshed.h>
+#include <ExploratoryLocationViewshed.h>
 
 // Qt
 #include <QDebug>
@@ -72,7 +72,7 @@ bool ViewshedAnalysis::execute(const QPointF &viewshedPoint_map_degree, double o
 
   for (int i = 0; i < m_viewsheds.size(); ++i)
   {
-    Esri::ArcGISRuntime::LocationViewshed *viewshed = m_viewsheds[i];
+    Esri::ArcGISRuntime::ExploratoryLocationViewshed *viewshed = m_viewsheds[i];
 
     if (viewshed)
     {
@@ -80,7 +80,7 @@ bool ViewshedAnalysis::execute(const QPointF &viewshedPoint_map_degree, double o
       delete viewshed;
     }
 
-    viewshed = new Esri::ArcGISRuntime::LocationViewshed(viewshedCenter
+    viewshed = new Esri::ArcGISRuntime::ExploratoryLocationViewshed(viewshedCenter
                                                          , heading
                                                          , 90.0          // pitch limited to 180
                                                          , deltaHeading  // horizontalAngle limited to 120, from release 100.3 maximum is 360 here