Parallel export (use par comemo) #2989
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This PR does the following changes:
rayonto get "free" parallel PNG and SVG export (brings a nice speedup)Deferred: PDF pagedeflateis done in parallelparking_lot(which is already in our tree from comemo) which doesn't have poisoning and therefore doesn't require unwrappingMutexin a place where aRwLockwas used but never read meaning that we had a useless atomic counterIt brings a nice boost in cold and incremental performance basically for free :)