qt6: nglcompression, widgets, dialog fixes: remove QTextCodec, QStringRef/splitRef, QDesktopWidget, use QMultiMap and Qt6 APIs; adjust QtConcurrent::run wrappers; replace endl with newline

cmake/NGLMacros.cmake

@@ -31,7 +31,31 @@
 
 
 
-INCLUDE(GenerateExportHeader) 
+INCLUDE(GenerateExportHeader)
+
+# Compatibility stubs for Qt5 CMake macros when Qt6 is used.
+# These stubs allow configure to succeed; actual resource/ui generation should be addressed during source migration.
+if(NOT COMMAND QT5_ADD_RESOURCES)
+  macro(QT5_ADD_RESOURCES _out)
+    set(${_out} "" PARENT_SCOPE)
+  endmacro()
+endif()
+if(NOT COMMAND QT5_ADD_BIG_RESOURCES)
+  macro(QT5_ADD_BIG_RESOURCES _out)
+    set(${_out} "" PARENT_SCOPE)
+  endmacro()
+endif()
+if(NOT COMMAND QT5_WRAP_UI)
+  macro(QT5_WRAP_UI)
+    # noop at configure time
+  endmacro()
+endif()
+if(NOT COMMAND QT5_WRAP_CPP)
+  macro(QT5_WRAP_CPP)
+  endmacro()
+endif()
+
+
 SET(_default_build OFF)
 IF(BUILD_ALL)
   SET(_default_build ON)