Add Fallout 76 support (basic)

[TDarkShadow]

Adding basic game support for Fallout 76.
Some of the basic functionalities are still missing like a mod data checker and an archive loader but require a bit more Python experience / knowledge than what I currently have.
Fix ModOrganizer2/modorganizer#1620

This is a basic game support replacement until a decent plugin can be developed (ModOrganizer2/modorganizer#1187).

[Kiaos]

why has this not been approved?

[Holt59]

why has this not been approved?

All the other plugins for Bethesda games are implemented in C++ and share a code base to avoid duplication. There was a tentative for a F76 plugin (see e.g. https://github.com/Holt59/modorganizer-game_fallout76) but since none of the lead devs own Fallout 76, this was never fully done.

If we include this basic game plugin in the official MO2 release, then it will be hard to switch to the C++ version in the future and we will need to re-implement many things on the Python side.

In the meantime, it's very easy to add this to your own install, maybe this can also be added to the WJ installation since it's simply a Python file to put in the right folder.

[Kiaos]

The only thing thats needed is the ability for the plugin to add any ba2 files to the ini otherwise im glad to be using mo2 instead of the quick config. https://github.com/Holt59/modorganizer-game_fallout76/issues/1