Core: refactor some loading mechanisms

[Berserker66]

What is this fixing or adding?

on its own, not much

How was this tested?

together with a new component that comes seperate

If this makes graphical changes, please attach screenshots.

[black-sliver]

This breaks the following use-case:
python Launcher.py Generate

[black-sliver]

I think the new code handles all use-cases we now have, with one exception:
Launching it with an invalid argument would not open to GUI previously. I don't have a strong opinion, but printing a message would be nice (in addition to opening the GUI), I think

With the current refactor, I think identify can be changed to only return 2 values - the original code would allow launching everything from the AP folder iirc, but that's not required anymore.

[Berserker66]

It is reduced to returning 2 values already, but the change in the branch is not showing up in this PR.

[Berserker66]

well, merging main into the branch again seems to have refreshed github

[black-sliver]

Do we want to log/print/show a message if the argument was ignored/not found? Once we decided that, I think this can be merged