Blender 5.0 compatibility

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Based on a review of the official Blender 5.0 API change notes, some testing, and user feedback, there are open items which need to be addressed in BlendLuxCore.
The change notes can be found here: https://developer.blender.org/docs/release_notes/5.0/python_api/

Reports may come from a mixture of LuxCore 2.10 and 2.11 development state, so compatibility will have to be evaulated for Blender LTS versions (4.2 and 4.5) with special care.

• The preset to create a light group node fails
• Material preview rendering fails (can't reproduce anymore, may have been a bad choice of test case)
• 'scene.node_tree' has been removed
• 'scene.use_nodes' is deprecated
• 'world.use_nodes' is deprecated
• 'material.use_nodes' is deprecated
• 'mathutils' was updated regarding numerical accuracy (float64 -> float32) in some unspecified ways. A potenital impact could be investigated.
  -- Don't see any reason at the moment to change anything, as Blender internal data structures, as far as I am aware, are all 32 bit or less anyways so it shouldn't matter
• 'action.fcurves' has been removed (TBC if this the specific fcurves attribute used in BLC in one location)

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Closing because compatibility by API documentation was completed.
If there are remaining issues, they will be dealt with in pre-release testing, or reported separately by users anyways.