Update v3.5.1

- Added a new item quality, "Uncommon": Similar to magic items, but while magic items have fixed modifiers, uncommon items can have any combination of random modifiers. Any "Normal" item can have an uncommon variant.
- Added 26 new items.
- Added an "Items" section in the help menu.
- Reduced the level requirement for almost all items in the game.
- Poison deals damage every turn
- Leech Totem now counts for physical spells
- Cure affliction is now a combat spell