Support Qt 6.8 for XR case

3D Designers are looking for the following minimum capability:

• The ability to compose a 3D scene in Design studio and view this easily on a target XR device. (through standalone deployment to the headset or onto the desktop for PC)

What specifically does this mean

• Template for quick 3D xr with the following options
  • CMakelist generation on (with the correct xr needed changes)

if(ANDROID)
    set_property(TARGET xr_simple APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/android)

endif()

if (APPLE AND CMAKE_SYSTEM_NAME STREQUAL "visionOS")
    set_target_properties(xr_simple PROPERTIES
        MACOSX_BUNDLE_GUI_IDENTIFIER io.qt.xr_simple
        MACOSX_BUNDLE_INFO_PLIST ${CMAKE_CURRENT_SOURCE_DIR}/visionos/MacOSXBundleInfo.plist.in
    )
endif()

• XrView as the root of app.qml / see the simple xr example
• Screen01.ui.qml would become Scene01 this is included in the app.qml
  • It has a Node as the root and this is where the user will add 3d content

What would be the next steps

• tick boxes in the wizard for controllers, for passthrough, spatial etc
• the ability to manipulate in a scene in vr an  the size, position, rotation of models, lights, etc and then pass that information back to design studio to update the layout of the scene
•