Prepare CMake to support both Qt5 andf Qt6

CEE_USE_QT6 controls if Qt6 is used.
Improved install and package for Qt6, target version Qt 6.5.3
Added Qt6 to github action for AppFwkUnitTest

Fwk/AppFwk/cafPdmScripting/cafPdmScripting_UnitTests/CMakeLists.txt

@@ -1,11 +1,20 @@
 project(cafPdmScripting_UnitTests)
 
-find_package(
-  Qt5
-  COMPONENTS
-  REQUIRED Core Xml Gui
-)
-set(QT_LIBRARIES Qt5::Core Qt5::Xml Qt5::Gui Qt5::Widgets)
+if(CEE_USE_QT6)
+  find_package(
+    Qt6
+    COMPONENTS
+    REQUIRED Core Gui Widgets
+  )
+  qt_standard_project_setup()
+else()
+  find_package(
+    Qt5
+    COMPONENTS
+    REQUIRED Core Xml Gui
+  )
+  set(QT_LIBRARIES Qt5::Core Qt5::Xml Qt5::Gui)
+endif()
 
 if(MSVC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 19.11))
   # VS 2017 : Disable warnings from from gtest code, using deprecated code
@@ -16,12 +25,16 @@ endif()
 include_directories(${CMAKE_CURRENT_SOURCE_DIR} # required for gtest-all.cpp
 )
 
-# add the executable
-add_executable(
-  ${PROJECT_NAME} cafPdmScripting_UnitTests.cpp gtest/gtest-all.cpp
+set(PROJECT_FILES cafPdmScripting_UnitTests.cpp gtest/gtest-all.cpp
                   cafPdmScriptingBasicTest.cpp cafPdmFieldSerializationTest.cpp
 )
 
+if(CEE_USE_QT6)
+  qt_add_executable(${PROJECT_NAME} ${PROJECT_FILES})
+else()
+  add_executable(${PROJECT_NAME} ${PROJECT_FILES})
+endif(CEE_USE_QT6)
+
 if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
   target_compile_options(
     cafPdmScripting_UnitTests PRIVATE -Wno-delete-abstract-non-virtual-dtor
@@ -29,7 +42,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
 endif()
 
 target_link_libraries(
-  ${PROJECT_NAME} cafPdmScripting ${QT_LIBRARIES} ${THREAD_LIBRARY}
+  ${PROJECT_NAME} PRIVATE cafPdmScripting ${QT_LIBRARIES} ${THREAD_LIBRARY}
 )
 
 source_group("" FILES ${PROJECT_FILES})
@@ -45,3 +58,18 @@ if(Qt5Core_FOUND)
     )
   endforeach(qtlib)
 endif(Qt5Core_FOUND)
+
+# Install
+install(
+  TARGETS ${PROJECT_NAME}
+  BUNDLE DESTINATION .
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+if(CEE_USE_QT6)
+  qt_generate_deploy_app_script(
+    TARGET ${PROJECT_NAME} OUTPUT_SCRIPT deploy_script
+    NO_UNSUPPORTED_PLATFORM_ERROR NO_TRANSLATIONS
+  )
+  install(SCRIPT ${deploy_script})
+endif(CEE_USE_QT6)