feat: Add item rarities into all storage overlay pages

src/main/kotlin/util/mc/FakeInventory.kt

@@ -0,0 +1,41 @@
+package util.mc
+
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.inventory.Inventory
+import net.minecraft.item.ItemStack
+
+class FakeInventory(val stack: ItemStack) : Inventory {
+	override fun clear() {
+	}
+
+	override fun size(): Int {
+		return 1
+	}
+
+	override fun isEmpty(): Boolean {
+		return stack.isEmpty
+	}
+
+	override fun getStack(slot: Int): ItemStack {
+		require(slot == 0)
+		return stack
+	}
+
+	override fun removeStack(slot: Int, amount: Int): ItemStack {
+		return ItemStack.EMPTY
+	}
+
+	override fun removeStack(slot: Int): ItemStack {
+		return ItemStack.EMPTY
+	}
+
+	override fun setStack(slot: Int, stack: ItemStack?) {
+	}
+
+	override fun markDirty() {
+	}
+
+	override fun canPlayerUse(player: PlayerEntity?): Boolean {
+		return true
+	}
+}

src/main/kotlin/util/mc/FakeSlot.kt

@@ -0,0 +1,15 @@
+package moe.nea.firmament.util.mc
+
+import util.mc.FakeInventory
+import net.minecraft.item.ItemStack
+import net.minecraft.screen.slot.Slot
+
+class FakeSlot(
+	stack: ItemStack,
+	x: Int,
+	y: Int
+) : Slot(FakeInventory(stack), 0, x, y) {
+	init {
+		id = 0
+	}
+}