Add item tiers

[Marilyth]

I think it would be interesting to start tracking tiered items

tbh its not worth to track items over tier 4 ?
maybe if you optimize the process then tier 5 could be good
but most of trades are tier 4

T1 max for class 1, T2 max for class 2, T3 max for class 3
it's just class 4 that's T10 max

[Marilyth]

Can somewhat easily be implemented now with the packet injection. I will see how many more items this will create and if that's feasible (up to tier 4)

[Marilyth]

7067 up from 4782. Each run for 4782 items currently takes about ~0.5 seconds per item.
2285 more items will add 19 more minutes to the extraction, landing at around 1 hour for a full extraction instead of 41 minutes.

[Marilyth]

Feedback from Discord has shown

• Tiers 1 - 4 should be enough for market tracking
  • Tier 5s exist sometimes, but probably not worth adding 300 more items for
  • Lower tier items can be used to upgrade higher tier items, so we shouldn't skip a tier
• Mostly classification 4 is relevant, whereas "lower classes are often used by wealthy low levels"
• Not all items are really relevant for tiers
  • Could maybe assign more priority for items that sell well on tier 0?
• Tiered items sell slowly