Update wrt Radium-Engine master#26

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dlyr wants to merge 2 commits intomasterfrom

release-candidate

Commits on Apr 6, 2023

update MeshAttrib access according to Radium pr #900 https://github.com/STORM-IRIT/Radium-Engine/pull/900
dlyr
committed
Fix dummy plugin naked new -> unique_ptr for task.
dlyr
committed