Add sell prices to most materials, add Singularity materials

Content/Items/Prefixes/SingularityPowered.cs

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+using Terraria;
+using Terraria.ModLoader;
+
+namespace ForgottenWawiTech.Content.Items.Prefixes
+{
+    public class SingularityPowered : ModPrefix
+    {
+        public override PrefixCategory Category => PrefixCategory.AnyWeapon;
+
+
+        // Prevent from being obtained through Goblin Tinkerer reforging
+        public override bool CanRoll(Item item) => false;
+
+        // Also prevent random roll chances on spawn
+        public override float RollChance(Item item) => 0f;
+
+        // +100% damage, +50% use time
+        public override void SetStats(
+            ref float damageMult,
+            ref float knockbackMult,
+            ref float useTimeMult,
+            ref float scaleMult,
+            ref float shootSpeedMult,
+            ref float manaMult,
+            ref int critBonus)
+        {
+            damageMult = 2f;
+            knockbackMult = 1.5f;
+            shootSpeedMult = 1.5f;
+            useTimeMult = 1.5f;
+        }
+
+        // Increase item value due to powerful stats
+        public override void ModifyValue(ref float valueMult)
+        {
+            valueMult *= 2f;
+        }
+    }
+}