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/token.h

@@ -0,0 +1,46 @@
+/*
+  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_TOKEN_H
+#define KTEXTTEMPLATE_TOKEN_H
+
+#include <QString>
+
+namespace KTextTemplate
+{
+
+/**
+  @internal
+
+  The available token types.
+*/
+enum TokenType {
+    TextToken, ///< The Token is a text fragment
+    VariableToken, ///< The Token is a variable node
+    BlockToken, ///< The Token is a block, ie, part of a tag
+    CommentToken ///< The Token is a comment node.
+};
+
+/// @headerfile token.h <KTextTemplate/Token>
+
+/**
+  A token in a parse stream for a template.
+
+  This class is only relevant for template tag implementations.
+*/
+struct Token {
+    int tokenType; ///< The Type of this Token
+    int linenumber; ///< The line number this Token starts at
+    QString content; ///< The content of this Token
+};
+}
+
+Q_DECLARE_TYPEINFO(KTextTemplate::Token, Q_RELOCATABLE_TYPE);
+
+#endif