Tensura: IaF treasure

adds:

---Cave dragon chests---

• 1-3 magic ores at same rarity as iron armor.
• 1-2 full potions at same rarity as iron armor.
• 1-7 silver ingots at slighty lower rarity (less rare) than obsidian cave dragons.
• 1-12 silver nuggets at slightly higher rarity (more rare) than gold ingots cave dragons.

---Dragon roosts--

• 1-2 low potions at slightly lower rarity (less rare) than skeleton skulls.
• 1-2 high potions at same rarity as skeleton skulls.
• 1 magic ore at same rarity as diamonds.
• 1-3 silver ingots at same rarity as packed ice in ice dragon roosts.
• 1-7 silver nuggets at slightly lower (less rare) rarity than books in ice dragon roosts.