Function game_library::data_loader::load_data_file_dir

pub fn load_data_file_dir(
    ew_spell_df: EventWriter<'_, LoadedSpellData>,
    ew_tileset_df: EventWriter<'_, LoadedTilesetData>,
    ew_particle_df: EventWriter<'_, LoadedParticleData>,
    ew_realm_df: EventWriter<'_, LoadedRealmData>,
    ew_simple_object_df: EventWriter<'_, LoadedSimpleObjectData>
)

Reading in the directory of ingestible files:

1. Should be recursive to get all subdirs
2. Should organize the files before reading them all in i. Read headers for all files ii. Discard any that are for wrong game version iii. Store [filename, header] in a list for each system iv. Sort the ingest data lists using any specified ordinal constraints
3. Add the data to the database in system load order (TDB)
4. Validate skill -> class, magic -> skill,class, and other relationships are valid