The Nanite builder now accepts a set of meshes that will be built into a single resource with a hierarchy root for each input mesh.
Updated runtime code to use this feature for Geometry collection.
Each GC now takes up just a single root page.
Changed geometry collection serialization so Nanite data is now transient similar to how it is transient in RenderData for StaticMesh.
Added bogus serialization functions for parsing and throwing away the old Nanite data, so we don't crash when parsing old files.
#rb brian.karis, graham.wihlidal
[CL 14828108 by Rune Stubbe in ue5-main branch]
Some UV utilities were moved from StaticMeshEditorExtension to DatasmithImporter.
All remaining references to EditableMesh were removed from engine code and plugins with former dependencies.
#rb Jean-Michel.Dignard, Jean-Luc.Corenthin, Michael.Lentine, Bill.Henderson
[CL 14421586 by Richard TalbotWatkin in ue5-main branch]
#rb none
#ROBOMERGE-OWNER: ori.cohen
#ROBOMERGE-AUTHOR: ori.cohen
#ROBOMERGE-SOURCE: CL 12623495 via CL 12623508 via CL 12623509 via CL 12623510
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v675-12543919)
[CL 12623517 by ori cohen in Main branch]
#rb none
#ROBOMERGE-OWNER: ori.cohen
#ROBOMERGE-AUTHOR: ori.cohen
#ROBOMERGE-SOURCE: CL 12510784 via CL 12510899 via CL 12510908 via CL 12510913
#ROBOMERGE-BOT: RELEASE (Release-Engine-Staging -> Main) (v673-12478461)
[CL 12510925 by ori cohen in Main branch]
#rnx
#rb none
#ROBOMERGE-OWNER: ryan.durand
#ROBOMERGE-AUTHOR: ryan.durand
#ROBOMERGE-SOURCE: CL 10869210 via CL 10869511 via CL 10869900
#ROBOMERGE-BOT: (v613-10869866)
[CL 10870549 by ryan durand in Main branch]
#rb none
#jira ue-75850
#lockdown nick.penwarden
#ROBOMERGE-SOURCE: CL 8069683 in //UE4/Release-4.23/...
#ROBOMERGE-BOT: RELEASE (Release-4.23 -> Main) (v400-8057353)
[CL 8069685 by michael lentine in Main branch]
