#UE4 Renaming assets no longer attempts to load all their referencers. This happens earlier in the rename process and is corretly skipped if being referenced by a map or already checked into SCC.
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Integrated using branch Ue4-To-UE4-Fortnite-Simple (reversed) of change#2401575 by Bob.Tellez on 2015/01/08 21:19:31.
[CL 2401576 by Bob Tellez in Main branch]
#ttp 348063 - Crash moving files in Content Browser
#branch UE4
#proj Developer.AssetTools, Editor.ContentBrowser, Editor.PackagesDialog, Editor.UnrealEd
[CL 2328547 by Richard TalbotWatkin in Main branch]
Removed UENUM() from EMyTownBuildingsWidgetSorting and EMyFortRatingStarSize to fix compile issues and because UENUM() was unnecessary.
Also made hand-fix to UAIHotSpotRenderingComponent by removing HeaderGroup (obsolete).
Did not merge TRV_HAF_Outer_012_lower_border or TRV_HAF_Outer_030 umaps due to conflicts and based on advice from Stefan.
[CL 2060490 by Daniel Broder in Main branch]
