Fix stack management for exported builds.
4.5 finally added the ability to get a stack tree without the editor present, aka in exported builds. Make sure Log supports this. There should be an if-statement in the logic that predicts whether we're in an exported build that has the signature "if get_stack().is_empty():" this alters the formatting of messages in exports and in the editor so only one message is printed at any given time.
We would likely need to change the printing logict to account for the ability to print the stack in exported builds to predict whether the editor is present, this could be done with something like "Engine.is_feature_present("Editor")" instead, but should probably rather focus on the structure... Any thoughts or ideas?