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/util.h

@@ -0,0 +1,96 @@
+/*
+  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_UTIL_P_H
+#define KTEXTTEMPLATE_UTIL_P_H
+
+#include "context.h"
+#include "ktexttemplate_export.h"
+#include "safestring.h"
+
+#include <QVariant>
+
+/// @file util.h Utility functions used throughout %KTextTemplate.
+/// @headerfile util.h <KTextTemplate/Util>
+
+namespace KTextTemplate
+{
+
+/**
+  Returns whether the @p variant is evaluated to true.
+
+  @see @ref truthiness
+*/
+KTEXTTEMPLATE_EXPORT bool variantIsTrue(const QVariant &variant);
+
+/**
+  Converts the @p input into its unescaped form.
+
+  Double slashes are converted to single slashes, \\&quot is converted to &quot
+  etc.
+*/
+KTEXTTEMPLATE_EXPORT QString unescapeStringLiteral(const QString &input);
+
+/**
+  Marks the @p input as safe.
+*/
+KTEXTTEMPLATE_EXPORT KTextTemplate::SafeString markSafe(const KTextTemplate::SafeString &input);
+
+/**
+  Marks the @p input as requiring escaping.
+*/
+KTEXTTEMPLATE_EXPORT KTextTemplate::SafeString markForEscaping(const KTextTemplate::SafeString &input);
+
+/**
+  Retrieves and returns a SafeString from the @p input.
+*/
+KTEXTTEMPLATE_EXPORT KTextTemplate::SafeString getSafeString(const QVariant &input);
+
+/**
+  Returns whether @p input contains a SafeString.
+*/
+KTEXTTEMPLATE_EXPORT bool isSafeString(const QVariant &input);
+
+/**
+  Returns true if the type of @p input can be inserted into a rendered template
+  directly.
+
+  Note that lists, hashes and QObject*s can not be.
+*/
+KTEXTTEMPLATE_EXPORT bool supportedOutputType(const QVariant &input);
+
+/**
+  Compares @p lhs and @p rhs for equality. SafeStrings are compared as raw
+  QStrings. Their safeness is not part of the comparison.
+
+  @see QVariant::operator==
+*/
+KTEXTTEMPLATE_EXPORT bool equals(const QVariant &lhs, const QVariant &rhs);
+
+/**
+  Converts @p size into the nearest file size unit like MB or MiB, based on the
+  @p unitSystem value. Use @c 2 for the @p unitSystem to get binary units, use
+  @c 10 to get decimal units - by default, decimal units will be returned. The
+  @p multiplier can be used if the input @p size is not in pure bytes. If @p
+  size is for example given in @a KiB, use a multiplier of @a 1024. The returned
+  pair will have the converted size as @a first and the unit as @a second.
+*/
+KTEXTTEMPLATE_EXPORT std::pair<qreal, QString> calcFileSize(qreal size, int unitSystem = 10, qreal multiplier = 1.0);
+
+#ifndef K_DOXYGEN
+/**
+  @internal
+  Returns the @p list as a formatted string. This is for debugging purposes
+  only.
+*/
+KTEXTTEMPLATE_EXPORT KTextTemplate::SafeString toString(const QVariantList &list);
+#endif
+}
+
+#endif