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/exception.h

@@ -0,0 +1,118 @@
+/*
+  This file is part of the KTextTemplate library
+
+  SPDX-FileCopyrightText: 2009, 2010 Stephen Kelly <steveire@gmail.com>
+
+  SPDX-License-Identifier: LGPL-2.1-or-later
+
+*/
+
+#ifndef KTEXTTEMPLATE_EXCEPTION_H
+#define KTEXTTEMPLATE_EXCEPTION_H
+
+#include "ktexttemplate_export.h"
+
+#include <QString>
+
+#include <exception>
+
+namespace KTextTemplate
+{
+
+/**
+  Types of errors that can occur while using %KTextTemplate
+*/
+enum Error {
+    NoError,
+    EmptyVariableError,
+    EmptyBlockTagError,
+    InvalidBlockTagError,
+    UnclosedBlockTagError,
+    UnknownFilterError,
+    TagSyntaxError,
+    //   VariableSyntaxError,
+
+    VariableNotInContext,
+    ObjectReturnTypeInvalid,
+    CompileFunctionError
+};
+
+/// @headerfile exception.h <KTextTemplate/Exception>
+
+/**
+  @brief An exception for use when implementing template tags.
+
+  The **%Exception** class can be used when implementing
+  AbstractNodeFactory::getNode. An exception can be thrown to indicate that
+  the syntax of a particular tag is invalid.
+
+  For example, the following template markup should throw an error because the
+  include tag should have exactly one argument:
+
+  @code
+    <div>
+      {% include %}
+    </div>
+  @endcode
+
+  The corresponding implementation of IncludeNodeFactory::getNode is
+
+  @code
+    QStringList tagContents = smartSplit( tagContent );
+
+    if ( tagContents.size() != 2 )
+      throw KTextTemplate::Exception( TagSyntaxError,
+        "Error: Include tag takes exactly one argument" );
+
+    // The item at index 0 in the list is the tag name, "include"
+    QString includeName = tagContents.at( 1 );
+  @endcode
+
+  @author Stephen Kelly <steveire@gmail.com>
+*/
+class KTEXTTEMPLATE_EXPORT Exception
+{
+public:
+    /**
+      Creates an exception for the error @p errorCode and the verbose
+      message @p what
+    */
+    Exception(Error errorCode, const QString &what)
+        : m_errorCode(errorCode)
+        , m_what(what)
+    {
+    }
+
+    virtual ~Exception() throw()
+    {
+    }
+
+#ifndef K_DOXYGEN
+    /**
+      @internal
+
+      Returns the verbose message for the exception.
+    */
+    const QString what() const throw()
+    {
+        return m_what;
+    }
+
+    /**
+      @internal
+
+      Returns the error code for the exception.
+    */
+    Error errorCode() const
+    {
+        return m_errorCode;
+    }
+#endif
+
+private:
+    Error m_errorCode;
+    QString m_what;
+};
+}
+
+#endif