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/abstractlocalizer.h

@@ -0,0 +1,140 @@
+/*
+  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_ABSTRACTLOCALIZER_H
+#define KTEXTTEMPLATE_ABSTRACTLOCALIZER_H
+
+#include "ktexttemplate_export.h"
+
+#include <QLocale>
+#include <QSharedPointer>
+#include <QVariantList>
+
+class QDateTime;
+
+namespace KTextTemplate
+{
+
+/// @headerfile abstractlocalizer.h <KTextTemplate/AbstractLocalizer>
+
+/**
+  @brief Interface for implementing an internationalization system.
+
+  This class defines an interface for accessing an internationalization, such as
+  QLocale/QTranslator or gettext/KLocale.
+
+  @author Stephen Kelly <steveire@gmail.com>
+*/
+class KTEXTTEMPLATE_EXPORT AbstractLocalizer
+{
+public:
+    /**
+     Constructor
+    */
+    AbstractLocalizer();
+
+    /**
+     Destructor
+    */
+    virtual ~AbstractLocalizer();
+
+    /**
+      Processes the data in @p variant into a localized string.
+
+      The base implementation can localize numbers, dates and times, and
+      strings.
+    */
+    virtual QString localize(const QVariant &variant) const;
+
+    /**
+      Returns the current locale as a string.
+    */
+    virtual QString currentLocale() const = 0;
+
+    /**
+      Makes this localizer use the locale specified by @p localeName for output.
+    */
+    virtual void pushLocale(const QString &localeName) = 0;
+
+    /**
+      Makes this localizer use the previous locale for output.
+     */
+    virtual void popLocale() = 0;
+
+    /**
+      Loads the @p catalog from @p path.
+    */
+    virtual void loadCatalog(const QString &path, const QString &catalog) = 0;
+
+    /**
+      Unloads the @p catalog
+    */
+    virtual void unloadCatalog(const QString &catalog) = 0;
+
+    /**
+      Localizes @p number
+    */
+    virtual QString localizeNumber(int number) const = 0;
+
+    /**
+      Localizes @p number
+    */
+    virtual QString localizeNumber(qreal number) const = 0;
+
+    /**
+      Localizes @p value as a monetary value in the currency specified by @p
+      currencyCode.
+    */
+    virtual QString localizeMonetaryValue(qreal value, const QString &currencyCode = {}) const = 0;
+
+    /**
+      Localizes @p date with the specified @p formatType
+    */
+    virtual QString localizeDate(const QDate &date, QLocale::FormatType formatType = QLocale::ShortFormat) const = 0;
+
+    /**
+      Localizes @p time with the specified @p formatType
+    */
+    virtual QString localizeTime(const QTime &time, QLocale::FormatType formatType = QLocale::ShortFormat) const = 0;
+
+    /**
+      Localizes @p dateTime with the specified @p formatType
+    */
+    virtual QString localizeDateTime(const QDateTime &dateTime, QLocale::FormatType formatType = QLocale::ShortFormat) const = 0;
+
+    /**
+      Localizes @p string with the specified @p arguments for substitution
+    */
+    virtual QString localizeString(const QString &string, const QVariantList &arguments = {}) const = 0;
+
+    /**
+      Localizes @p string, disambiguated by @p context with the specified @p
+      arguments for substitution
+    */
+    virtual QString localizeContextString(const QString &string, const QString &context, const QVariantList &arguments = {}) const = 0;
+
+    /**
+      Localizes @p string or its @p pluralForm with the specified @p arguments
+      for substitution
+    */
+    virtual QString localizePluralString(const QString &string, const QString &pluralForm, const QVariantList &arguments = {}) const = 0;
+
+    /**
+      Localizes @p string or its @p pluralForm, disambiguated by @p context with
+      the specified @p arguments for substitution
+    */
+    virtual QString
+    localizePluralContextString(const QString &string, const QString &pluralForm, const QString &context, const QVariantList &arguments = {}) const = 0;
+
+private:
+    Q_DISABLE_COPY(AbstractLocalizer)
+};
+}
+
+#endif