Migrate from Legacy Fabric to Ornithe gen2

[DaveyL2013]

I'd PR it myself but I could not figure out how to map the instructions to whatever weird multiloader setup this is ^{_{(why is this even using it when it's only for LF? Could probably stand to be pulled out in a refactor, although that is probably a lot of work not to mention another issue entirely unrelated to this one anyway lol)}}

[LunasaVT]

Migrating to Ornithe gen 2 is planned, and we'll hopefully have it done very soon.

The multi-loader set up is a left over from Sodium, we decided to keep it as we thought it may aid when adding support for other loaders, if that ever becomes needed. I do want to retain the multi-loader setup though, even after migrating to Ornithe gen2.