Added EC6 module handling and fixed up Blueprints

[profK]

Will load and execute scripts with the extension .mjs as EC6 modules I hope its reasonably clean. I kept all my code to a new file except for the hook to invoke it.

This does make it a bit redundant but had the smallest impact on the original codebase.

I also made UJavaIsolate a UCLASS(BlueprintType) to expose it for creation in blueprints in UE5 and added a trivial Blueprint example