Rewrites a lot of scrapper code to fix actual and potential bugs

src/main/java/net/knarcraft/blacksmith/container/RecipeResult.java

@@ -0,0 +1,16 @@
+package net.knarcraft.blacksmith.container;
+
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.Recipe;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * The result of a recipe's salvage
+ *
+ * @param recipe  <p>The selected recipe</p>
+ * @param salvage <p>The resulting salvage</p>
+ */
+public record RecipeResult(@NotNull Recipe recipe, @NotNull List<ItemStack> salvage) {
+}