This can read basic MDL files (no terrain, shadow, edge geometry, etc.)
and export them to OBJ. This will be expanded in future commits to let
you export this to an easily readable vertex/index list.
This code is mostly based off of xivModdingFramework/Lumina, and just
ported to C++. All of it will eventually be refactored as there is
duplicate structs EVERYWHERE.
Now you can easily parse EXL files, and this commit includes changes
to GameData to easily extract a EXH from just an excel sheet name
like "Item" or "Map". However this still doesn't work for language
seperated excel sheets yet.
