For parsing attributes from SKU strings.
```rs use tf2sku::{SKU, tf2enum::{Quality, KillstreakTier}};
let sku = SKU::try_from("264;11;kt-3").unwrap();
asserteq!(sku.defindex, 264); asserteq!(sku.quality, Quality::Strange); asserteq!(sku.killstreaktier, Some(KillstreakTier::Professional)); ```