reworks (thx dargkkast), more consistent lib functions, total item rework

src/items/lootbox.ts

@@ -1,9 +0,0 @@
-import { getInventory, updateInventory } from "../lib/userHelper";
-
-export async function changeLootboxCount(username: string, amount = -1): Promise<itemChangeResult> {
-    let inv = await getInventory(username)
-    if (amount < 0 && inv.lootbox+ amount < 0) return {result: false, count: inv.lootbox}
-    inv.lootbox += amount
-    await updateInventory(username, inv)
-    return {result: true, count: inv.lootbox}
-}