Add materials for Astramora/Niko, Neptune and Lyyka

Content/Items/Materials/FallenAngelFeather.cs

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+// NOTE: Drop from Astramora Noctis boss post-SCal. Meant for material crafting.
+using Terraria.ID;
+using Terraria;
+using Terraria.ModLoader;
+using ForgottenWawiTech.Content.Rarities;
+
+namespace ForgottenWawiTech.Content.Items.Materials
+{
+    public class FallenAngelFeather : ModItem
+    {
+
+        public override void SetDefaults()
+        {
+            Item.width = 20;
+            Item.height = 20;
+            Item.maxStack = 9999;
+            Item.rare = ModContent.RarityType<SingularityItem>();
+            Item.value = Item.buyPrice(platinum: 1);
+        }
+
+    }
+}

Content/Items/Materials/HalfEatenFish.cs

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+// NOTE: Drop from Neptune boss.
+using Terraria;
+using Terraria.ID;
+using Terraria.ModLoader;
+using ForgottenWawiTech.Content.Rarities;
+
+namespace ForgottenWawiTech.Content.Items.Materials
+{
+    public class HalfEatenFish : ModItem
+    {
+        public override void SetDefaults()
+        {
+            Item.width = 20;
+            Item.height = 12;
+            Item.maxStack = 9999;
+            Item.value = Item.sellPrice(silver: 5);
+            Item.rare = ModContent.RarityType<FWTDeveloperItem>();
+        }
+    }
+}

Content/Items/Materials/LyykaBossDrop.cs

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+// TODO: Get a name and vibe idea from Lyyka
+using Terraria;
+using Terraria.ID;
+using Terraria.ModLoader;
+using ForgottenWawiTech.Content.Rarities;
+
+namespace ForgottenWawiTech.Content.Items.Materials
+{
+    public class LyykaBossDrop : ModItem
+    {
+        public override void SetDefaults()
+        {
+            Item.width = 30;
+            Item.height = 30;
+            Item.value = Item.sellPrice(gold: 15);
+            Item.rare = ModContent.RarityType<AvalianItem>();
+            Item.maxStack = 9999;
+        }
+    }
+}