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/cafUserInterface/cafUserInterface_UnitTests/CMakeLists.txt

@@ -2,12 +2,22 @@ cmake_minimum_required(VERSION 3.15)
 
 project(cafUserInterface_UnitTests)
 
-find_package(
-  Qt5
-  COMPONENTS
-  REQUIRED Core Gui Widgets
-)
-set(QT_LIBRARIES Qt5::Core Qt5::Gui Qt5::Widgets Qt5::OpenGL)
+# Qt
+if(CEE_USE_QT6)
+  find_package(
+    Qt6
+    COMPONENTS
+    REQUIRED Core Gui Widgets Svg
+  )
+  qt_standard_project_setup()
+else()
+  find_package(
+    Qt5
+    COMPONENTS
+    REQUIRED Core Gui Widgets OpenGL
+  )
+  set(QT_LIBRARIES Qt5::Core Qt5::Gui Qt5::OpenGL)
+endif()
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR} # required for gtest-all.cpp
 )
@@ -16,13 +26,16 @@ set(PROJECT_FILES cafUserInterface_UnitTests.cpp cafPdmUiTreeViewModelTest.cpp
                   cafPdmUiTreeSelectionQModelTest.cpp gtest/gtest-all.cpp
 )
 
-# add the executable
-add_executable(${PROJECT_NAME} ${PROJECT_FILES})
+if(CEE_USE_QT6)
+  qt_add_executable(${PROJECT_NAME} ${PROJECT_FILES})
+else()
+  add_executable(${PROJECT_NAME} ${PROJECT_FILES})
+endif(CEE_USE_QT6)
 
 source_group("" FILES ${PROJECT_FILES})
 
 target_link_libraries(
-  ${PROJECT_NAME} cafUserInterface ${QT_LIBRARIES} ${THREAD_LIBRARY}
+  ${PROJECT_NAME} PRIVATE cafUserInterface ${QT_LIBRARIES} ${THREAD_LIBRARY}
 )
 
 # Copy Qt Dlls
@@ -34,3 +47,18 @@ foreach(qtlib ${QT_LIBRARIES})
             $<TARGET_FILE_DIR:${PROJECT_NAME}>
   )
 endforeach(qtlib)
+
+# 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)