Move ToolMenus module from Runtime to Developer, also removed one dependency on engine (Timer)

#rb none
#rnx

[CL 7773074 by Rex Hill in Dev-Editor branch]

Engine/Source/Developer/ToolMenus/Private/ToolMenusModule.cpp

@@ -0,0 +1,30 @@
+// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
+
+#include "CoreMinimal.h"
+#include "Modules/ModuleManager.h"
+#include "IToolMenusModule.h"
+
+
+/**
+ * Implements the Tool menus module.
+ */
+class FToolMenusModule
+	: public IToolMenusModule
+{
+public:
+
+	// IToolMenusModule interface
+
+	virtual void StartupModule( ) override
+	{
+	}
+
+	virtual void ShutdownModule( ) override
+	{
+	}
+
+	// End IToolInterface interface
+};
+
+
+IMPLEMENT_MODULE(FToolMenusModule, ToolMenus)