Merge remote-tracking branch 'origin/master' into 1.13

# Conflicts:
#	Flax.flaxproj
#	Source/Engine/Level/Actors/StaticModel.cpp
#	Source/Engine/Level/Prefabs/Prefab.cpp
#	Source/Engine/Tools/ModelTool/ModelTool.cpp

Source/Engine/Content/Asset.cpp

@@ -272,6 +272,7 @@ String Asset::ToString() const
 
 void Asset::OnDeleteObject()
 {
+    PROFILE_CPU_NAMED("Asset.Unload");
     ASSERT(IsInMainThread());
 
     // Send event to the gameplay so it can release handle to this asset