Fix item database
This removes some redudancies on item_db which are not needed (like Job: All and Gender: All - these are already the defaults).
It also removes BuyingStore from all items because it is not supported by ManaPlus AFAIK.
At the very bottom if fix arrow subtype from W_DAGGER to A_ARROW (otherwise some spells might fail - like arrow shower)
It also fixes other bugs on item database:
- Pumpkin Juice had wrong item type
- Iron/Concentration Potions were broken
- All three mana potions were broken (now they work and heal instantly)
- Correct some healing delays, fixing Cherry Cake along the way.
According to WildX: protein based = heals over long time; carb based = heals quicker The amount of healing would just depend on where the item is found and player level
Edited by Jesusaves