SceneOutliner refactor

Scene Outliner refactored to remove all actor-specific code.
Now uses modular modes and hierarchies to allow representation of any data model.

#rb patrick.enfedaque matt.kuhlenschmidt
#jira none
#fyi tim.gautier

[CL 13922848 by roey borsteinas in ue5-main branch]

Engine/Source/Editor/SceneOutliner/Private/SceneOutlinerSharedData.cpp

@@ -0,0 +1,23 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include "Modules/ModuleManager.h"
+
+#include "SceneOutlinerPublicTypes.h"
+
+#include "SceneOutlinerModule.h"
+
+namespace SceneOutliner
+{
+
+void FSharedOutlinerData::UseDefaultColumns()
+{
+	FSceneOutlinerModule& SceneOutlinerModule = FModuleManager::LoadModuleChecked<FSceneOutlinerModule>("SceneOutliner");
+
+	// Create an instance of every default column type
+	for (auto& DefaultColumn : SceneOutlinerModule.DefaultColumnMap)
+	{
+		ColumnMap.Add(DefaultColumn.Key, DefaultColumn.Value);
+	}
+}
+
+}	// namespace SceneOutliner