FStaticMeshLODResources are now ref counted to prevent deleting the data while it is being accessed.
The stream out strategy now involves waiting several frame before streaming out, if there are external references to the LOD.
This number of checks is controlled by the new "r.Streaming.MaxReferenceChecksBeforeStreamOut" with a default value of 3.
Disabled StaticMesh streaming while in the editor to prevent issues with tools.
UNiagaraDataInterfaceStaticMesh now correctly support preview feature level and in game LOD streaming.
LODData that is cached initialization time is now invalidated if that LOD is streamed out, this
only affect GPU sampling and FStaticMeshFilteredAreaWeightedSectionSampler).
#rb jian.ru
#ROBOMERGE-SOURCE: CL 12469631 via CL 12469638 via CL 12469648
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v672-12450963)
[CL 12469663 by uriel doyon in Main branch]