[refactor] Held Item Tooltips

[lonefelidae16]

close #228

Supports Lingering Potions, Water Bottle, Awkward Potion, and more.

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Changes

• update HeldItemTooltips.java

  • method:
  • getTooltips become null-safe
  • getTooltipsFromEffectList(List<StatusEffectInstance>) -> getTooltipsForPotion(List<Text>)
  • equals become more simply
  • drawItemWithCustomTooltips handles Text instead of Tooltip

• update PotionTooltip.java

  • method: <init>(StatusEffectInstance) -> <init>(Text)
  • initialize with generated tooltip text

• update Tooltip.java

  • method: equals
  • overrides the Java utility method