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/external/include/KF6/KTextTemplate/ktexttemplate/qtlocalizer.h

@@ -0,0 +1,110 @@
+/*
+  This file is part of the KTextTemplate library
+
+  SPDX-FileCopyrightText: 2010 Stephen Kelly <steveire@gmail.com>
+
+  SPDX-License-Identifier: LGPL-2.1-or-later
+
+*/
+
+#ifndef KTEXTTEMPLATE_QTLOCALIZER_P_H
+#define KTEXTTEMPLATE_QTLOCALIZER_P_H
+
+#include "abstractlocalizer.h"
+
+class QTranslator;
+
+namespace KTextTemplate
+{
+
+class QtLocalizerPrivate;
+
+/// @headerfile qtlocalizer.h <KTextTemplate/QtLocalizer>
+
+/**
+  @brief Provides internationalization based on QLocale and QTranslator.
+
+  This class implements access to the %Qt Localization system. Localizable
+  types such as strings, numbers, dates and times can be processed.
+
+  @code
+    auto t = m_engine->loadTemplate(someTemplate);
+    auto c = getContext();
+
+    // Render with the German locale
+    c.setLocalizer(m_de_Localizer);
+    auto deText = t->render(&c);
+    de_display->setText(deText);
+
+    // Render with the French locale
+    c.setLocalizer(m_fr_Localizer);
+    auto frText = t->render(&c);
+    fr_display->setText(frText);
+  @endcode
+
+*/
+class KTEXTTEMPLATE_EXPORT QtLocalizer : public AbstractLocalizer
+{
+public:
+    /**
+      Constructs a new **%QtLocalizer** using the @p locale
+    */
+    QtLocalizer(const QLocale &locale = QLocale::system());
+
+    /**
+      Destructor
+     */
+    ~QtLocalizer() override;
+
+    /**
+      Set the path to look for translations of the application strings.
+     */
+    void setAppTranslatorPath(const QString &path);
+
+    /**
+      Set the prefix of translation files. For example, if the German translation
+      file is called <tt>myapp_de_DE.qm</tt>, the prefix should be set to
+      <tt>myapp_</tt>.
+     */
+    void setAppTranslatorPrefix(const QString &prefix);
+
+    /**
+      Install a @p translator to use for a particular @p localeName.
+
+      @code
+        auto deTranslator = new QTranslator(this);
+        auto loaded = deTranslator->load("myapp_de_DE");
+        if (!loaded)
+          return;
+
+        de_localizer->installTranslator(deTranslator, "de_DE");
+      @endcode
+     */
+    void installTranslator(QTranslator *translator, const QString &localeName = QLocale::system().name());
+
+    QString currentLocale() const override;
+    void pushLocale(const QString &localeName) override;
+    void popLocale() override;
+    void loadCatalog(const QString &path, const QString &catalog) override;
+    void unloadCatalog(const QString &catalog) override;
+
+    QString localizeNumber(int number) const override;
+    QString localizeNumber(qreal number) const override;
+    QString localizeMonetaryValue(qreal value, const QString &currencyCode = {}) const override;
+    QString localizeDate(const QDate &date, QLocale::FormatType formatType = QLocale::ShortFormat) const override;
+    QString localizeTime(const QTime &time, QLocale::FormatType formatType = QLocale::ShortFormat) const override;
+    QString localizeDateTime(const QDateTime &dateTime, QLocale::FormatType formatType = QLocale::ShortFormat) const override;
+    QString localizeString(const QString &string, const QVariantList &arguments = {}) const override;
+    QString localizeContextString(const QString &string, const QString &context, const QVariantList &arguments = {}) const override;
+    QString
+    localizePluralContextString(const QString &string, const QString &pluralForm, const QString &context, const QVariantList &arguments = {}) const override;
+    QString localizePluralString(const QString &string, const QString &pluralForm, const QVariantList &arguments = {}) const override;
+
+private:
+    Q_DECLARE_PRIVATE(QtLocalizer)
+    Q_DISABLE_COPY(QtLocalizer)
+    QtLocalizerPrivate *const d_ptr;
+};
+}
+
+#endif